C/C++ Program to find frequency count of a character in a given text

//Program to find frequency count of a character in a given text
#include<iostream>
using namespace std;
int main()
   {
    char a[100],ch;
    int i,f=0;
    cout<<"\n Enter a string : ";
    cin>>a;
    cout<<"\n enter a character to find its frequency : ";
    cin>>ch;
    for(i=0;a[i]!='\0';i++)
       {
        if(ch==a[i])
            f++;
       }
    cout<<"\n Frequency count of "<<ch<<" is : "<<f;
    cout<<endl;
return 0;
}