C programs for: 1. Anagrams 2. Decimal to hexadecimal 3. Factorial [Passed codes] [With explanation]

1. Swadeshi MicroprocessorQuiz2020 (Start-upIndia)
C problems:
1. Anagram(Checkingif twowordsare anagrams or not andignore case)
Ex: Stressedanddesserts - yes
#include <stdio.h>
int check_anagram(char [], char []);
void main()
{
char a[100], b[100];
int flag;
printf("Enter first stringn");
gets(a);
printf("Enter second stringn");
gets(b);
flag = anagram_checker(a, b);
if (flag == 1)
printf(""%s" and "%s" are anagrams.n", a, b);
else
printf(""%s" and "%s" are not anagrams.n", a, b);
getch();
}
int anagram_checker(char s1[], char s2[])
{
int first[26] = {0}, second[26] = {0}, c = 0;
int i;
for(i=0; s1[i] != '0'; i++)
{
s1[i] = tolower(s1[i]);
}
for(i=0; s2[i] != '0'; i++)
{
s2[i] = tolower(s2[i]);
}
while (s1[c] != '0')
{
first[s1[c]-'a']++;
c++;
}
c = 0;
while (s2[c] != '0')
{
second[s2[c]-'a']++;
c++;
}
for (c = 0; c < 26; c++)
{
if (first[c] != second[c])
return 0;
}
return 1;
}

2. 2. Convertdecimal tohexadecimal
#include <stdio.h>
int main()
{
int num;
printf("Enter decimal number: ");
scanf("%d", &num);
decimal_to_hexa(num);
return 0;
}
void decimal_to_hexa(int num){
int i=0, j = 0;
long remainder, quotient;
char hexadecimalnum[100];
quotient = num;
while (quotient != 0)
{
remainder = quotient % 16;
if (remainder < 10)
hexadecimalnum[j++] = 48 + remainder;
else
hexadecimalnum[j++] = 55 + remainder;
quotient = quotient / 16;
}
// display integer into character
for (i = j-1; i >= 0; i--)
printf("%c", hexadecimalnum[i]);
}
3. Factorial
Input- testcasesscansnumberof testcasesfor factorial,thenenterthe numberforeach
factorial
Ex-
2
2
4
Output- Factorial of twonumbers:2->2 , 4->24
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
int factorial(int num)
{
// Please write your code in this function
int factorial = 1;
while(num){
factorial*=num;
num-=1;
}
return factorial;
}
int main(){

3. int testcases, num;
int result;
scanf("%d", &testcases);
while(testcases){
scanf("%d", &num);
result = factorial(num);
printf("%dn", result);
testcases--;
}
}