atoi – Windows Questions

Category : atoi

invalid conversion from ‘int’ to ‘const char*’ [-fpermissive]| (beginner)

21st January 2021 atoi, c++, integer, string

When I try to compile my code this error pops out: invalid conversion from ‘int’ to ‘const char*’ My task is to write a program that calculates the sum of numbers with odd index. Please don’t roast me (I’m learning how to code in c++), and give some tips how to fix it and get ..

getting garbage output for converting start of string to integer

22nd September 2020 atoi, c++, char, integer, string

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_ ..

Using atoi() and stderr to convert string to integer

15th September 2020 atoi, c++, integer, stderr, string

I’m trying to use atoi() to convert a string to an integer, print the integer, and use stderr to give an error message. I’m not sure how to use stderr. #include <iostream> #include <sstream> #include <stdlib.h> #include <stdio.h> using namespace std; int main() { char* str; int result; cout << "Please enter a number to ..