In this slide, we discussed the assignment of solving known programming problems.

1. Task3: Write a C program to sort array elements in ascending order.
Ans:
#include <stdio.h>
int main()
{
int array[100];
int size;
int i, j, temp;
printf("Enter size of array: n");
scanf("%d", &size);
printf("Enter elements in array: n");
for(i=0; i<size; i++)
{
scanf("%d", &array[i]);
}
for(i=0; i<size; i++)
{
for(j=i+1; j<size; j++)
{
if(array[i] > array[j])
{
temp = array[i];
array[i] = array[j];
array[j] = temp;

2. }
}
}
printf("nElements of array in sorted ascending order: t");
for(i=0; i<size; i++)
{
printf("%dt", array[i]);
}
return 0;
}
Task 4: Write a C program to add two matrices.
Ans:
#include <stdio.h>
int main()
{
int A[3][3], B[3][3], C[3][3];
int row, col;
printf("Enter elements in matrix A of size 3x3: n");
for(row=0; row<3; row++)
{
for(col=0; col<3; col++)
{
scanf("%d", &A[row][col]);
}
}

3. printf("nEnter elements in matrix B of size 3x3: n");
for(row=0; row<3; row++)
{
for(col=0; col<3; col++)
{
scanf("%d", &B[row][col]);
}
}
for(row=0; row<3; row++)
{
for(col=0; col<3; col++)
{
C[row][col] = A[row][col] + B[row][col];
}
}
printf("nSum of matrices A+B = n");
for(row=0; row<3; row++)
{
for(col=0; col<3; col++)
{
printf("%d ", C[row][col]);
}
printf("n");
}

4. return 0;
}
Task 5: Write a C program to find total number of alphabets, digits or special character in a string.
Ans:
#include <stdio.h>
int main()
{
char str[100];
int alphabets, digits, others, i;
alphabets = digits = others = i = 0;
/* Input string from user */
printf("Enter any string : n");
gets(str);
/*
* Check each character of string for alphabet, digit or special character
*/
while(str[i]!='0')
{
if((str[i]>='a' && str[i]<='z') || (str[i]>='A' && str[i]<='Z'))
{
alphabets++;
}

5. else if(str[i]>='0' && str[i]<='9')
{
digits++;
}
else
{
others++;
}
i++;
}
printf("Alphabets = %dn", alphabets);
printf("Digits = %dn", digits);
printf("Special characters = %d", others);
return 0;
}
Task6: Write a C program to count total number of vowels and consonants in a string.
Ans:
#include <stdio.h>
#include <string.h>
int main()
{
char string[100];
int i, len, vowel, consonant;
printf("Enter any string: n");
gets(string);

6. vowel = 0;
consonant = 0;
len = strlen(string);
for(i=0; i<len; i++)
{
if(string[i] =='a' || string[i]=='e' || string[i]=='i' || string[i]=='o' || string[i]=='u' || string[i]=='A'
|| string[i]=='E' || string[i]=='I' || string[i]=='O' || string[i]=='U')
{
vowel++;
}
else if((string[i]>='a' && string[i]<='z') || (string[i]>='A' && string[i]<='Z'))
{
consonant++;
}
}
printf("Total number of vowel = %dn", vowel);
printf("Total number of consonant = %dn", consonant);
return 0;
}
Task7: Write a C program to check whether a string is palindrome or not.
Ans:
#include <stdio.h>
#include <string.h>
int main()
{
char string[100], reverse[100];

7. int flag;
printf("Enter any string: n");
gets(string);
strcpy(reverse, string);
strrev(reverse);
flag = strcmp(string, reverse);
if(flag == 0)
{
printf("String is Palindrome.n");
}
else
{
printf("String is Not Palindrome.n");
}
return 0;
}
Task8: Write a C program to find all prime numbers between given interval using functions.
Ans:
#include <stdio.h>
int checkPrimeNumber(int n);
int main()

8. {
int n1, n2, i, flag;
printf("Enter two positive integers: ");
scanf("%d %d", &n1, &n2);
printf("Prime numbers between %d and %d are: ", n1, n2);
for(i=n1+1; i<n2; ++i)
{
// i is a prime number, flag will be equal to 1
flag = checkPrimeNumber(i);
if(flag == 1)
printf("%d ",i);
}
return 0;
}
// user-defined function to check prime number
int checkPrimeNumber(int n)
{
int j, flag = 1;
for(j=2; j <= n/2; ++j)
{
if (n%j == 0)
{
flag =0;
break;
}
}

9. return flag;
}
Task9:
Write a C program to find factorial of any number using recursion.
Ans:
#include <stdio.h>
long int multiplyNumbers(int n);
int main()
{
int n;
printf("Enter a positive integer: ");
scanf("%d", &n);
printf("Factorial of %d = %ld", n, multiplyNumbers(n));
return 0;
}
long int multiplyNumbers(int n)
{
if (n >= 1)
return n*multiplyNumbers(n-1);
else
return 1;
}
Task10: Write a C program to generate nth Fibonacci term using recursion.
Ans:
/**
* C program to find nth Fibonacci term using recursion
*/

10. #include <stdio.h>
/* Function declaration */
unsigned long long fibo(int num);
int main()
{
int num;
unsigned long long fibonacci;
/* Input a number from user */
printf("Enter any number to find nth fiboacci term: ");
scanf("%d", &num);
fibonacci = fibo(num);
printf("%d fibonacci term is %llu", num, fibonacci);
return 0;
}
/**
* Recursive function to find nth Fibonacci term
*/
unsigned long long fibo(int num)
{
if(num == 0) //Base condition
return 0;

11. else if(num == 1) //Base condition
return 1;
else
return fibo(num-1) + fibo(num-2);
}
Task11: To write a C program to print the abbreviation of an Organization.
Output:
Enter the full form of an organization
bangladesh machines
The abbreviation of bangladesh machines is "BM"
Ans:
/* Write person's name in abbreviated form */
#include <stdio.h>
int main()
{
char fname[20], mname[20], lname[20]; /* person's name */
/* accept full name */
printf("Enter full name (first middle last): ");
scanf("%s %s %s", fname, mname, lname);
/* print abbreviated name */
printf("Abbreviated name: ");

12. printf("%c. %c. %c.n", fname[0], mname[0], lname[0]);
return 0;
}
Task12: Write a program for nested structure, the two structures are declared within a single
structure. The two inner structures are : “dob” ( fields : dd, mm, yy) and “address” (st, cty) and the
outer structure “Student” ( fields : rollno, name). Write a main program to get and display the details
of N students.
Ans:
eta ektu edit kore nite hobe//////////////////
Ans:
#include<stdio.h>
struct Address
{
char HouseNo[25];
char City[25];
char PinCode[25];
};
struct Employee
{
int Id;
char Name[25];
float Salary;
struct Address Add;
};
void main()

13. {
int i;
struct Employee E;
printf("ntEnter Employee Id : ");
scanf("%d",&E.Id);
printf("ntEnter Employee Name : ");
scanf("%s",&E.Name);
printf("ntEnter Employee Salary : ");
scanf("%f",&E.Salary);
printf("ntEnter Employee House No : ");
scanf("%s",&E.Add.HouseNo);
printf("ntEnter Employee City : ");
scanf("%s",&E.Add.City);
printf("ntEnter Employee House No : ");
scanf("%s",&E.Add.PinCode);
printf("nDetails of Employees");
printf("ntEmployee Id : %d",E.Id);
printf("ntEmployee Name : %s",E.Name);
printf("ntEmployee Salary : %f",E.Salary);
printf("ntEmployee House No : %s",E.Add.HouseNo);
printf("ntEmployee City : %s",E.Add.City);
printf("ntEmployee House No : %s",E.Add.PinCode);
}

14. Task13: A file named DATA.txt contains a series of integer numbers. Write a program to read these
numbers and then write all odd numbers to a file to be called ODD.txt and all even numbers to a file
to be called EVEN.txt.
Ans:
#include<stdio.h>
#include<conio.h>
#include<process.h>
void main()
{
int a,n,i;
FILE *fp1,*fp2,*fp3;
clrscr();
fp1=fopen(“DATA”,”w”);
if(fp1==NULL)
{
printf(“File could not open!!”);
exit(0);
}
printf(“How many numbers?”);
scanf(“%d”,&n);
printf(“Enter contents of DATA file:n”);
for(i=0;i<n;++i)
{
scanf(“%d”,&a);
putw(a,fp1);
}

15. fclose(fp1);
fp1=fopen(“DATA”,”r”);
fp2=fopen(“ODD“,”w”);
fp3=fopen(“EVEN”,”w”);
if(fp1==NULL||fp2==NULL||fp3==NULL)
{
printf(“File could not open!!”);
exit(0);
}
while((a=getw(fp1))!=EOF)
{
if(a%2!=0)
putw(a,fp2);
else
putw(a,fp3);
}
fclose(fp1);
fclose(fp2);
fclose(fp3);
fp2=fopen(“ODD”,”r”);
fp3=fopen(“EVEN”,”r”);
if(fp2==NULL||fp3==NULL)
{
printf(“File could not open!!”);
exit(0);

16. }
printf(“nContents of ODD file:n”);
while((a=getw(fp2))!=EOF)
printf(“%d “,a);
printf(“nnContents of EVEN file:n”);
while((a=getw(fp3))!=EOF)
printf(“%d “,a);
fclose(fp2);
fclose(fp3);
getch();
}