#asctoint

The task was to write a function int AscToInt(const char *num); that converts a string from the user’s input, presumably containing numbers, to an actual integer as its return. A string might be either positive or negative (e.g.”-123123” or “+234234” or “989”). If input string contains an alphabetic character or symbol different from “+” or “-” the function is to return 0. Here’s my pretty easy solution: #include <iostream> #include <cstring> #include <cstring> #include <cmath> using namespace std; int AscToInt(const char* num) {     int converted = 0;     char *str;     bool negative = false;     int i = 0;         if (num[0] == '-' || num[0] == '+') {         if (num[0] == '-') {             negative = true;         }         for (i = 0; i < strlen(num); i++) {             str[i] = num[i+1];         }         str[i] = '\0';     } else {         strcpy(str, num);     }         for (i = 0; i < strlen(str); i++) {         if ( (str[i] <= '0' || str[i] >= '9') && !negative) {             converted = 0;             break;         }         converted += pow(10, (strlen(str) - 1) - i) * (str[i] - '0');     }         if(negative) {         converted = -abs(converted);     }     return converted; } int main() {     char* str;     int num = 0;     cout<< "enter string containing numbers: ";     cin >> str;     num = AscToInt(str);     cout << num;     return 0; } It’s kind of a challenge with some benefits for the winners. The function above handles positive and negative numbers and declines inappropriate input. The only thing I haven’t implemented here is that it doesn’t check the length of the input string which can be damaging, but it’s not a part of a task. BTW: haven’t been touched C/C++ since last December cos I didn’t have a challenge!