first single char

#include <iostream>using namespace std;//first single char char firstSingle(char *str){int a[255];//char 0-255memset(a,0,sizeof(int)*255);char *p = str;while (*p != '\0'){a[*p]++;p++;}p = str;while (*p != '\0'){if (a[*p] == 1){return *p;}p++;}return '\0';}int main(void){char a[] = "abacfeds";cout<<a<<endl;char ch = firstSingle(a);cout<<"single char:"<<ch;system("pause");return 0;}