C-Program to count number of times a letter repeated in sentence

#include<stdio.h>

#include<string.h>

int main()

{

int i,count=0;

char c,str[100];

printf("Enter a sentence\n");

gets(str);

printf("Enter a character to know it's repetance in sentence\n");

scanf("%c",&c);

for(i=0;i<strlen(str);i++)

{

    if(str[i]==c)

    {

        count++;

    }

}

printf("Letter %c repeated %d times\n",c,count);

return 0;

}