I am supposed to make a function which outputs integers at the start of string.

```
int num_neg(char a_){
if(a_ == '0' || a_ == '1' || a_ == '2' || a_ == '3' || a_ == '4' || a_ == '5' || a_ == '6' || a_ == '7' || a_ == '8' || a_ == '9' || a_ == '-') return 1;
else return 0;
}
int char_num(char b_){
if(b_ == '0') return 0;
if(b_ == '1') return 1;
if(b_ == '2') return 2;
if(b_ == '3') return 3;
if(b_ == '4') return 4;
if(b_ == '5') return 5;
if(b_ == '6') return 6;
if(b_ == '7') return 7;
if(b_ == '8') return 8;
if(b_ == '9') return 9;
// else return -1;
}
int Solution::atoi(const string A) {
int M = A.size();
int num=0;
int x;
int flag = 0;
int neg = 0;
for(int i=0; i<M; i++){
if(A[i] == ' ' && flag == 0) continue;
if(num_neg(A[i]) == 0){
break;
}
if(A[i] == '-'){
if(neg == 1) break;
neg = 1;
flag = 1;
continue;
}
x = char_num(A[i]);
num = num*10 + x;
if(flag == 0) flag = 1;
}
if(neg == 1) num = -num;
if(num > INT_MAX) return INT_MAX;
if(num < INT_MIN) return INT_MIN;
return num;
}
```

Assume int Solution::atoi() is a function called in main function with inputs as string. I am getting garbage output for input of A = "+7" while expected output is "**7**". What am I doing wrong in here.

**EDIT: the input case was wrong in the previous question asked. The problem was with input: "+7" and I got it resolved. Thanks to everyone.**

Source: Windows Questions C++