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How do I check a string is number or not in c language?

Mukul Goenka 458 08 Nov 2021

How do I check a string is number or not in java language?

Ask by Mukul Goenka

Updated 08 Nov 2021

1 Answers

Ravi Vishwakarma 08 Nov 2021

In this program validate the string for accepting the digit value.

Program

#include <stdio.h>
int check_digit(char *str);
int main()
{
    char *str ='45n82';

    if(check_digit(str))
        printf('%s is digit',str);
    else
        printf('%s is not digit',str);
        
    return 0;
}
int check_digit(char *str){
    int isDigit = 0;
    while (*str) {
        if (*str == '\0') 
            break;
        else if(*str>=48 && *str<=57)
            isDigit = 1;
        else{
            isDigit = 0;
            break;
        }
        str++;
    }
    return isDigit;
}

Output

45n82 is not digit

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