The document contains C code snippets for various programming problems including calculating the area of shapes, finding roots of quadratic equations, sorting arrays, matrix multiplication, and more. The last problem is a program to list the names of students who scored over 60% total marks across three subjects, using a structure variable to store student data.

1. PART- A
1a. WAP to find the area of the triangle
#include<stdio.h>
#include<conio.h>
#include<math.h>
void main()
{
float a,b,c,area,s;//s is semi perometer i.e. s=(a+b+c)/2
clrscr();
printf("enter the three sides of triangle");
scanf("%f%f%f",&a,&b,&c);
if((a+b)>c&&(a+c)>b&&(b+c)>a)
{
s=(a+b+c)/2;
area=sqrt(s*(s-a)*(s-b)*(s-c)) ;
printf("the area of given triangle is-->%f",area);
}
else
printf("the sides given are invalid...enter vaild sides");
getch();
}

2. Output
enter the three sides of triangle
1
1
1
the area of given triangle is-->0.433013
1b. Wap to find the area of the circle
#include<stdio.h>
#include<conio.h>
void main()
{
float p=3.14,r,area;
clrscr();
printf("Enter the value of radious = ");
scanf("%f",&r);
area=p*r*r;
printf("nThe area of circle is = %f",area);
getch();
}

3. Output
Enter the value of radious = 2
The area of circle is = 12.560000
2. Wap to find the simple interest ,given the principle,time and rate of
interest with appropriate validation
#include<stdio.h>
#include<conio.h>
void main()
{
int p,t;
float r,si;
clrscr();
printf("n enter principle,rate and time");
scanf("%d%f%d",&p,&r,&t);
si=(p*r*t)/100;
printf("n simple interest:%f",si);
getch();
}
Output
Enter the year which you know to check that it is leap year or not:->2008
The given year is leap year

4. 3. WAP to check whether the given year is leap year or not
#include<stdio.h>
#include<conio.h>
void main()
{
int n;
clrscr();
printf("n Enter the year which you know to check that it is leap year or not:->");
scanf("%d",&n);
if((n%400==0)||(n%4==0)&&(n%100!=0))
{
printf("n The given year is leap year");
}
else
{
printf("n The given year is not a leap year");
}
getch();
}

5. 4. WAP to find the root of the quadratic equation with appropriate
message.
//roots of the quadratic equation
#include<stdio.h>
#include<conio.h>
#include<math.h>
void main()
{
int a,b,c,d=0,rp,ip;
float x1,x2,e;
clrscr();
printf("n enter the coefficient of a,b and c");
scanf("%d%d%d",&a,&b,&c);
if(a>0)
{
d=b*b-4*a*c;
if(d==0)
{
printf("n roots are equal");
x1=x2=-b/(2*a);
printf("n root 1=%f",x1);
printf("n root 2=%f",x2);

6. }
else if(d>0)
{
e=sqrt(d);
printf("n roots are real");
x1=-(b+e)/(2*a);
x2=-(b+e)/(2*a);
printf("n root 1=%f",x1);
printf("n root 2=%f",x2);
}
else
{
printf("root are imaginary");
}
}
else
{
printf("n this is not a quadratic equation");
}
getch();
}

7. 6. WAP to find GCD and LCM of given two numbers
#include<stdio.h>
#include<conio.h>
void main()
{
int u,v,temp,a,b,lcm,gcd;
clrscr();
printf("n enter two number");
scanf("%d%d",&u,&v);
a=u;
b=v;
while(v!=0)
{
temp=u%v;
u=v;
v=temp;
}
gcd=u;
lcm=(a*b)/gcd;
printf("n GCD of two number=%d",gcd);
printf("n LCM of the two number=%d",lcm);
getch();
}

8. 7. WAP to calculate sin(x) series.
#include<stdio.h>
#include<conio.h>
void main()
{
int n,sign=1,i;
float x,t,sum;
clrscr();
printf("n enter value of x and n");
scanf("%f%d",&x,&n);
x=(3.14 /180)*x;
sum=t=x;
for(i=1;i<n;i++)
{
sign=-1;
t=sign*t*x*x/(2*i*(2*i+1));
sum=sum+t;
}
printf("sum of sin x series=%f",sum);
getch();
}

9. 8. WAP to print all prime numbers between m and n
#include<stdio.h>
#include<conio.h>
void main()
{
int m,n,i,j,prime=0;
clrscr();
printf("n enter two number from which you want to check prime number");
scanf("%d%d",&m,&n);
if(m<2)
m=2;
for(i=m;i<=n;i++)
{
prime=1;
for(j=2;j<=i-1;j++)
if (i%j==0)
{
prime=0;
break;
}
if(prime)
printf("n %dt",i);

10. }
getch();
}
9. WAp to reverse a number and check whether it is palindrome or not
#include<stdio.h>
#include<conio.h>
void main()
{
int n,d,r=0,u=0;
clrscr();
printf("n enter a number");
scanf("%d",&n);
u=n;
while(n!=0)
{
d=n%10;
r=(r*10)+d;
n=n/10;
}
if (r==u)
printf("n number is palindrome");
else
printf("n number is not palindrome");
getch();

11. }
10 WAP to generate and print first n Fibonacci numbers using function.
#include<stdio.h>
#include<conio.h>
void fibo(int);
void main()
{
int n;
clrscr();
printf("n enter the limit of the seriesn");
scanf("%d",&n);
fibo(n);
getch();
}
void fibo(int n)
{
int a=0,b=1,c,i=3;
printf("n fibonacci series=n");
if(n<1)
printf("enter the valid limit");
else
if(n==1)
printf("0");
else if(n==2)
printf("%dt%d",a,b);

12. else
{
printf("0 t 1");
while(i<=n)
{
c=a+b;
printf("t%d",c);
a=b;
b=c;
i++;
}
}
}
11 WAP to find factorial of a given number usind recursive function.
#include<stdio.h>
#include<conio.h>
int factorial();
void main()
{
int n;
clrscr();
printf("n enter a numbern");
scanf("%d",&n);
printf("n factorial=%d",factorial(n));
getch();
}

13. int factorial(int n)
{
if(n==0)
{
return(1);
}
else
{
return(n*factorial(n-1));
}
}
12 WAP to convert upper case alphabets to lower case alphabets in the given
string and vice versa.
#include<stdio.h>
#include<conio.h>
#include<string.h>
void main()
{
char str[20];
int i;
clrscr();
puts("enter a stringn");
gets(str);
printf("n original string=%s",str);
for(i=0;str[i]!='0';i++)
{

14. if(str[i]>='A' && str[i]<='Z')
{
str[i]=str[i]+32;
}
else
if(str[i]>='a' && str[i]<='z')
{
str[i]=str[i]-32;
}
}
printf("n change string is:%s",str);
getch();
}
13 write a program to read two strings and concatenate them (without using
library function).
#include<stdio.h>
#include<conio.h>
#include<string.h>
void main()
{
char str1[20],str2[10];
int i=0,j=0;
clrscr();
puts("enter string first");

15. gets(str1);
puts("n enter string second");
gets(str2);
while(str1[i]!='0')
{
str1[i++];
}
while(str2[j]!='0')
{
str1[i]=str2[j];
str1[i++];
str2[j++];
str1[i]='0';
}
printf("concaneted string=");
puts(str1);
getch();
}
14 WAP to read a sentence and count the number of vovel and consonant.
PART -B
1. WAP to read N integer (zero,+ve and -ve) into an arrey and find the
sum of positive numbers, sum of negative numbers and average of
all input numbers
#include<stdio.h>

16. #include<conio.h>
void main()
{
int a[20],n,i,sum1=0,sum2=0;
float avg=0.0;
clrscr();
printf("n enter the size of the arrayn");
scanf("%d",&n);
printf("enter array element 1 by 1 n ");
for(i=0;i<n;i++)
scanf("%d",&a[i]);
for(i=0;i<n;i++)
{
if(a[i]>0)
sum1=sum1+a[i];
else
sum2=sum2+a[i];
}
avg=(sum1+sum2)/n;
printf("n sum of posotive number=%d",sum1);
printf("n sum of negative number =%d",sum2);
printf("n average on entered number =%f",avg);
getch();
}

17. 2. WAP to input N real numbers and to find the mean , variance and
standard deviation
#include<stdio.h>
#include<conio.h>
#include<math.h>
void main()
{
float a[20],sum=0.0,mean=0.0,var,sumsqr,dev;
int n,i;
clrscr();
printf("n enter the size of the arrayn");
scanf("%d",&n);
printf("enter array element 1 by 1 n ");
for(i=0;i<n;i++)
{
scanf("%f",&a[i]);
sum=sum+a[i];
}
mean=sum/n;
for(i=0;i<n;i++)
sumsqr=sumsqr+((a[i]-mean)*(a[i]-mean));
var=sumsqr/n;
dev=sqrt(var);
printf("n mean of entered number =%f",mean);
printf("n variatiuon=%f",var);

18. printf("n deviation=%f",dev);
getch();
}
3. WAP to input N numbers and store them in an array and apply
linear search
#include<stdio.h>
#include<conio.h>
void main()
{
int a[20],item,i,flag=0;
int n;
clrscr();
printf("n enter size of the arrayn");
scanf("%d",&n);
printf("n enter array element 1 by 1 n");
for(i=0;i<n;i++)
scanf("%d",&a[i]);
printf("n enter a searching numbern");
scanf("%d",&item);
for(i=0;i<n;i++)
if(item==a[i])
{
flag=1;
break;

19. }
if(flag)
printf("n searching number %d is found at %d position",item,i+1);
else
printf("n searching value not found");
getch();
}
4. WAP to sort N numbers is ascending order or descending order
using bubble sort
#include<stdio.h>
#include<conio.h>
void main()
{
int a[10],i,j,n,temp;
clrscr();
printf("n enter the size of the arrayn");
scanf("%d",&n);
printf("n enter the array element 1 by 1 n");
for(i=0;i<n;i++)
scanf("%d",&a[i]);
printf("n after insertion array is n");
for(i=0;i<n;i++)

20. printf("%dt",a[i]);
for(i=0;i<n-1;i++)
for(j=i+1;j<n;j++)
if(a[i]>a[j])
{
temp=a[i];
a[i]=a[j];
a[j]=temp;
}
printf("n after sorting in ascending order array isn");
for(i=0;i<n;i++)
printf("%dt",a[i]);
getch();
}
5. WAP to implement binary search
//binary searching
#include<stdio.h>
#include<conio.h>
void main()
{
int a[10],i,j,n,temp,item,ub,lb,mid,found=0;
clrscr();
printf("n enter the size of the arrayn");
scanf("%d",&n);

21. printf("n enter the array element 1 by 1 in ascending ordern");
for(i=0;i<n;i++)
scanf("%d",&a[i]);
printf("n after insertion array is n");
for(i=0;i<n;i++)
printf("%dt",a[i]);
for(i=0;i<n-1;i++)
for(j=i+1;j<n;j++)
if(a[i]>a[j])
{
temp=a[i];
a[i]=a[j];
a[j]=temp;
}
printf("n enter a searching numbern");
scanf("%d",&item);
lb=0;
ub=n-1;
while(lb<ub)
{
mid=(lb+ub)/2;
if(item==a[mid])
{
found=1;
break;

22. }
if(item<a[mid])
ub=mid-1;
else
lb=mid+1;
}
if(found)
printf("n searching value is found at %d position",mid+1);
else
printf("n searching value not found");
getch();
}
6. WAP to read two matrices A & B of size M*N and perform product
of two given matrices.
#include<stdio.h>
#include<conio.h>
int main()
{
int a[' '][' '],b[' '][' '],c[' '][' '],i,j,k,m1,n1,m2,n2;
clrscr();
printf("n enter the order of the first matrix");
scanf("%d%d",&m1,&n1);
printf("n enter the order of the second matrix");
scanf("%d%d",&m2,&n2);
if(m1!=n2)
{
printf("multiplication not possible");
getch();
return 0;
}
printf("n enter matrix 1 element 1 by 1");

23. for(i=0;i<m1;i++)
{
for(j=0;j<n1;j++)
{
scanf("%d",&a[i][j]);
}
}
printf("n enter matrix 2 element 1 by 1");
for(i=0;i<m2;i++)
{
for(j=0;j<n2;j++)
{
scanf("%d",&b[i][j]);
}
}
printf("n matrix 1 isn");
for(i=0;i<m1;i++)
{
for(j=0;j<n1;j++)
printf("%dt",a[i][j]);
printf("n");
}
printf("n matrix 2 is n");
for(i=0;i<m2;i++)
{
for(j=0;j<n2;j++)
printf("%dt",b[i][j]);
printf("n");
}
// multiplication start
for(i=0;i<m1;i++)
{
for(j=0;j<n1;j++)
{
c[i][j]=0;
for(k=0;k<m1;k++)
c[i][j]=c[i][j]+a[i][k]*b[k][j];
}
}
printf("n after multip[lication matrix 3 is n");
for(i=0;i<m1;i++)
{

24. for(j=0;j<n2;j++)
printf("%dt",c[i][j]);
printf("n");
}
getch();
return 0;
}
7. WAP to list the name of the students who have scored more than
60% of total marks in three subject using str var
#include<Stdio.h>
#include<conio.h>
struct student
{
int usn;
char name[10];
int marks[3];
int total;
};
struct student s[5];
void main()
{
int i,j,n;
clrscr();
printf("n enter the number of the studentn");
scanf("%d",&n);
for(i=0;i<n;i++)
{

25. printf("n enter the details of %d studentn",i+1);
printf("enter student usnn");
scanf(" %d",&s[i].usn);
printf("n enter student namen");
scanf("%s",&s[i].name);
printf("n enter three paper marks 1 by 1 n");
for(j=0;j<3;j++)
{
scanf("%d",&s[i].marks[j]);
s[i].total=s[i].total+s[i].marks[j];
}
}
clrscr();
printf("n n student details (scored more than 60%).....");
printf("n ..........");
for(i=0;i<n;i++)
{
if(s[i].total>=180)
{
printf("n usn no.=%d",s[i].usn);
printf("n student name=%s",s[i].name);
printf("n total marks=%d",s[i].total);
}
printf("nnn");
}

26. getch();
}
8 WAP to compute the sum of two complex number-passing a structure
to a function.
#include<stdio.h>
#include<conio.h>
struct complex
{
int real,imag;
};
typedef struct complex s;
void main()
{
s x,y;
clrscr();
printf("n enter the first complex number");
printf("n enter real part=");
scanf("%d",&x.real);
printf("n enter the imaginary part=");
scanf("%d",&x.imag);
printf("n enterthe second imaginary part");
printf("n enter real part=");
scanf("%d",&y.real);
printf("n enter imaginary part=");
scanf("%d",&y.imag);

27. printf("n addition of two complex number
is=(%d+i%d)+(%d+i%d)=(%d+i%d)",x.real,x.imag,y.real,y.imag,x.real+y.real,x.imag+y.imag);
getch();
}
9. Define a book structure having book info . WAP to accept date and list
out all the book infopublished during date.
#include<stdio.h>
#include<conio.h>
struct date
{
int month;
int year;
};
typedef struct date pdate;
struct book
{
int isbn;
char title[20];
char author[20];
int price;
pdate date;
};
typedef struct book books;
void main()
{
pdate search;

28. books mca[20];
int n,i;
clrscr();
printf("n enter how many xbookst");
scanf("%d",&n);
for(i=0;i<n;i++)
{
printf("n enter the details of %d books n",i+1);
printf("n enter the isbn number t");
scanf("%d",&mca[i].isbn);
printf("n enter the name of the bookt");
scanf("%s",mca[i].title);
printf("n enter the author namet");
scanf("%s",mca[i].author);
printf("n enter the price of the bookt");
scanf("%d",&mca[i].price);
printf("n enter the mounth of the publicationt");
scanf("%d",&mca[i].date.month);
printf("n enter the year of the publicationt");
scanf("%d",&mca[i].date.year);
}
printf("n enter the month of publication that to searcht");
scanf("%d",&search.month);
printf("n enter the year of publication to searcht");
scanf("%d", &search.year);

29. printf("nn book datails.....n");
for(i=0;i<n;i++)
{
if((mca[i].date.month==search.month)&&(mca[i].date.year==search.year))
{
printf("n title=%s",mca[i].title);
printf("n isbn=%d",mca[i].isbn);
printf("n author name=%s",mca[i].author);
printf("n price of the book=%d",mca[i].price);
printf("n month of publication=%d",mca[i].date.month);
printf("n year of publication=%d",mca[i].date.year);
}
}
getch();
}
10. define structure having students info with 5 sub marks using array,
list out all the failed students.
#include<stdio.h>
#include<conio.h>
struct student
{
char name[20];
int usn,tot,sub[5];
};
void main()

30. {
int i,n,j;
struct student std[10];
clrscr();
printf("n enter the number of the student t");
scanf("%d",&n);
printf("n enter the student details..");
for(i=0;i<n;i++)
{
std[i].tot=0;
printf("n enter name of the %d student=t",i+1);
scanf("%s",std[i].name);
printf("n enter usn of the %d student=t",i+1);
scanf("%d",&std[i].usn);
printf("n enter marks of the %d student==t",i+1);
for(j=0;j<5;j++)
{
printf("n enter subject %d markst",j+1);
scanf("%d",&std[i].sub[j]);
while(std[i].sub[j]>100)
{
printf("marks over flow n reemter the markst");
scanf("%d",&std[i].sub[j]);
}
std[i].tot+=std[i].sub[j];

31. }
}
printf("n list of failed studentsn");
for(i=0;i<n;i++)
{
if(std[i].tot<200)
{
printf("n name=%st",std[i].name);
printf("n usn=%dt",std[i].usn);
printf("n total=%d",std[i].tot);
}
}
getch();
}
11. WAP to find the sum of n integers in an array using pointers.
#include<stdio.h>
#include<conio.h>
void main()
{
int n,arr[10],i,*p,sum=0;
p=arr;
clrscr();
printf("n enter the size of the arrayn");
scanf("%d",&n);
printf("n enter %d numbern",n);

32. for(i=0;i<n;i++)
{
scanf("%d",&arr[i]);
}
for(i=1;i<=n;i++)
{
sum=sum+*p;
*p++;
}
printf("n sum of all the number =%d",sum);
getch();
}
12. WAP to read and write to a file.
#include<stdio.h>
#include<conio.h>
FILE *fp;
void main()
{
char name[20];
int usn,marks,n,i;
clrscr();
fp=fopen("student.dat","w");
printf("n how many student records you want to enter t");
scanf("%d",&n);
for(i=1;i<=n;i++)

33. {
printf("n enter %d student name t",i);
scanf("%s",&name);
printf("n enter %d student usn t",i);
scanf("%d",&usn);
printf("n enter %d student marks t",i);
scanf("%d",&marks);
fprintf(fp,"%st%dt%dn",name,usn,marks);
}
fclose(fp);
fp=fopen("student.dat","r");
printf("students records are n");
for(i=1;i<=n;i++)
{
fscanf(fp,"%s%d%d",&name,&usn,&marks);
printf("nnn name of %d student=%s",i,name);
printf("n usn of %d student=%d",i,usn);
printf("n marks of %d student=%d",i,marks);
}
fclose(fp);
getch();
}
13. wap to creat and count number of character in a file.
#include<stdio.h>
void main()

34. {
FILE *f;
char fname[20],c;
int ctr=0;
clrscr();
f=fopen("rj","w");
fclose(f);
printf("n enter the file name to openn");
scanf("%s",fname);
f=fopen("fname","r");
if (!f)
printf("n file not exist..permission denied");
else
{
c=getc(f);
for(;getc(f)!=EOF;ctr++)
{
}
printf("n total count of character is %d",ctr);
}
getch();
}

35. 14. WAP to handle file with mixed data type.
#include<stdio.h>
struct emp
{
char name[20];
int empno;
float sal;
char status[10];
};
void main()
{
typedef struct emp s;
s s1;
FILE *f;
clrscr();
f=fopen("deepak.txt","w");
/* if(!f)
puts("file not exist.permission denied");
else
{ */
printf("...employee details......n");
printf("n enter the employee name=");
scanf("%s",s1.name);
//fflush(stdin);
printf("n enter the employee number =");
scanf("%d",&s1.empno);

36. printf("n enter employee salary=");
scanf("%f",&s1.sal);
// fflush(stdin);
printf("n enter the employee status=");
scanf("%s",s1.status);
// fprintf(f,"%s%d%f%c",s1.name,s1.empno,s1.sal,s1.status);
fclose(f);
f=fopen("deepak.txt","r");
// fscanf(f,"%s%d%f%c",s1.name,&s1.empno,&s1.sal,s1.status);
printf("n name=%s",s1.name);
printf("n emp number =%d",s1.empno);
printf("n employee salary=%f",s1.sal);
printf("n employee status=%s",s1.status);
fclose(f);
getch();
}