Case conversion Hacker Earth Solution in C

 https://www.hackerearth.com/practice/basic-programming/implementation/basics-of-implementation/practice-problems/algorithm/case-conversion-d19fbcfe/submissions/

#include<stdio.h>

#include<string.h>

int main()

{

int t;

scanf("%d", &t);

while(t--)

{

char s[105],temp[200];

scanf(" %s", s);

strcpy(temp,s);

int i,j;

if(s[0] >= 'A' && s[0] <= 'Z')

temp[0]=s[0]+32;

for(i=1,j=1;s[i] != '\0';i++)

{

if(s[i] >= 'A' && s[i] <= 'Z')

{

temp[j++]='_';

temp[j++]=s[i]+32;

}

else

temp[j++]=s[i];

}

temp[j]='\0';

printf("%s\n", temp);

}

}