Frequency of each character in the string

#include<stdio.h>

void main()

{

char s[100];

int f[256]={0},i,j;

fgets(s,100,stdin); //gets(s);

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

{

f[s[i]]++;

}

for(i=0;i<256;i++)

{

if(f[i]>0)

printf("%c occurs %d times\n",i,f[i]);

}

}

Input:

helLo how@are_raju*@#

Output

 occurs 1 times

  occurs 1 times

# occurs 1 times

* occurs 1 times

@ occurs 2 times

L occurs 1 times

_ occurs 1 times

a occurs 2 times

e occurs 2 times

h occurs 2 times

j occurs 1 times

l occurs 1 times

o occurs 2 times

r occurs 2 times

u occurs 1 times

w occurs 1 times