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Convert string (char array) to int.

 


#include <iostream>
#include <cmath>
using namespace std;
 
int a2i(char* s) {
    
    int n = 0;
    while ((*s)!='\0')
        n=n*10+ ( (*s++)-'0' );
    return n;
}
 
int main() {
 
    char s[6] = "12345";
    int a = a2i( & s[0] );
    cout << a;
    return 0;
}

 

 

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