Find the first un-repeated character in a string

Question

What is the quickest way to find the first character which only appears once in a string?

Answer 1

Different approach here. scan each element in the string and create a count array which stores the repetition count of each element. Next time again start from first element in the array and print the first occurrence of element with count = 1

C code 
-----
#include 
#include 

int main(int argc, char *argv[])
{
    char t_c;
    char *t_p = argv[1] ;
    char count[128]={'\0'};
    char ch;

    for(t_c = *(argv[1]); t_c != '\0'; t_c = *(++t_p))
        count[t_c]++;
    t_p = argv[1];
    for(t_c = *t_p; t_c != '\0'; t_c = *(++t_p))
    {
        if(count[t_c] == 1)
        {
            printf("Element is %c\n",t_c);
            break;
        }
    }

return 0;    
}