String to int c

atoi(str) is unsafe

This is the prefered method:
(int)strtol(str, (char **)NULL, 10)

How to string to integer in c++

#include<string>
string str1 = "45"; 
string str2 = "3.14159"; 
string str3 = "31337 geek";

int myint1 = stoi(str1);
std::cout<<stoi(str1);

C string is int

int isNumber(char s[])
{
    for (int i = 0; s[i]!= '\0'; i++)
    {
        if (isdigit(s[i]) == 0)
              return 0;
    }
    return 1;
}

Convert string to int c

const char *number = "10";
char *end;
long int value = strtol(number, &end, 10); 
if (end == number || *end != '\0' || errno == ERANGE)
    printf("Not a number");
else
    printf("Value: %ld", value);

Source: stackoverflow.com

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