check_if_integer.c

#include "monty.h"

/**
 * check_if_integer - checks if a string contains a number
 * @arg: string to be checked
 * Return: 1 if true or 0 if false
 */
int check_if_integer(char *arg)
{
	int i = 0;

	if (arg[i] == '-')
		i++;
	while (*(arg + i) != '\0')
	{
		if (*(arg + i) >= '0' && *(arg + i) <= '9')
			i++;
		else
			return (0);
	}
	return (1);
}