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How to check if a C/C++ string is an int?
There are several methods to check that string is an int or not and one of those method is to use isdigit() to check the string.
Here is an example to check whether a string is an int or not in C++ language,
Example
#include<iostream>
#include<string.h>
using namespace std;
int main() {
char str[] = "3257fg";
for (int i = 0; i < strlen(str); i++) {
if(isdigit(str[i]))
cout<<"The string contains int\n";
else
cout<<"The string does not contain int\n";
}
return 0;
}Output
Here is the output
The string contains int The string contains int The string contains int The string contains int The string does not contain int The string does not contain int
In the above program, the actual code of checking the string is present in main() function. Using built-in method isdigit(), each character of string is checked. If the string character is a number, it will print that string contains int. If string contains character or alphabet, it will print that string does not contain int.
for (int i = 0; i < strlen(str); i++) {
if(isdigit(str[i]))
printf("The string contains int\n");
else
printf("The string does not contain int\n");
}
Updated on: 31-Oct-2023
22K+ Views
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