Check if a string contains only digits

Problem statement:- Program to Check if a string contains only digits or not.

Example:-

              Input: Given

                                 String=49875

             Output: string contains only digits.

            Input: Given

                                String=csinfo360

             Output: String does not contain only digits.

Data requirement:-

   Input Data:- str

  Output Data:-string output

  Additional Data:- in, count, len

Program in C

Here is the source code of the C Program to Check if a string contains only digits or not.

Code:

#include<stdio.h>

#include<string.h>

main()

{

    int count=0,in;

    char str[100]={0};

    printf("Enter your String:");

    gets(str);

     for(in=0;in<strlen(str);in++)

    {

            if(str[in] >= '0' && str[in] <= '9')

            {

                  count++;

            }

    }

    if(count==strlen(str))

        printf("String contains only digits.");

    else

        printf("String does not contains only digits.");

}

Input/Output:

Enter your String:49875

string contains only digits.

Program in C++

Here is the source code of the C++ Program to Check if a string contains only digits or not.

Code:

#include<iostream>

#include <cstring>

using namespace std;

main()

{

    int count=0,in;

    string str;

    cout<<"Enter your String:";

    getline(cin,str);

    int len=0;

     for(in=0;str[in]!='\0';in++)

    {

        len++;

    }

     for(in=0;in<len;in++)

    {

            if(str[in] >= '0' && str[in] <= '9')

            {

                  count++;

            }

    }

    if(count==len)

        cout<<"String contains only digits.";

    else

        cout<<"String does not contain only digits.";

}

Input/Output:

Enter your String:csinfo360

String does not contain only digits.

Program in Java

Here is the source code of the Java Program to Check if a string contains only digits or not.

Code:

import java.util.Scanner;

public class ContainsOnlyDigits {

public static void main(String[] args) {

Scanner cs=new Scanner(System.in);

String str;

int count=0,in;

System.out.println("Enter your String:");

str=cs.nextLine();

for(in=0;in<str.length();in++)

    {

            if(str.charAt(in) >= '0' && str.charAt(in) <= '9')

            {

                  count++;

            }

    }

    if(count==str.length())

    System.out.print("String contains only digits.");

    else

    System.out.print("String does not contains only digits.");

cs.close();

}

}

Input/Output:

Enter your String:

csinfo360.com

String does not contain only digits.

Program in Python

Here is the source code of the Python Program to Check if a string contains only digits or not.

Code:

str=input("Enter Your String:")

count=0

for inn in range(0,len(str)):

    if str[inn] >= '0' and  str[inn] <= '9':

        count+=1

if count==len(str):

    print("String contains only digits.")

else:

    print("String does not contain only digits.")

Input/Output:

Enter Your String:9875410

String contains only digits.

More:-

C/C++/Java/Python Practice Question