C Program to Read a String and find the Sum of all Digits in the String

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This is a C program to read a string and find the sum of all digits in the string.

Problem Description

This program takes a string containing both digits and alphabet as input and finds the sum of all digits in the string.

Problem Solution

1. Take the string as input.
2. Check for the digits in the string.
3. Count the number of digits and add all the digits to get the sum.

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Program/Source Code

Here is source code of the C program to read a string and find the sum of all digits in the string. The C program is successfully compiled and run on a Linux system. The program output is also shown below.

  1.  
  2.  
  3. /*
  4.  * C program to find the sum of all digits present in the string
  5.  */
  6. #include <stdio.h>
  7. void main()
  8. {
  9.     char string[80];
  10.     int count, nc = 0, sum = 0;
  11.  
  12.     printf("Enter the string containing both digits and alphabet \n");
  13.     scanf("%s", string);
  14.     for (count = 0; string[count] != '\0'; count++)
  15.     {
  16.         if ((string[count] >= '0') && (string[count] <= '9'))
  17.         {
  18.             nc += 1;
  19.             sum += (string[count] - '0');
  20.         }
  21.     }
  22.     printf("NO. of Digits in the string = %d\n", nc);
  23.     printf("Sum of all digits = %d\n", sum);
  24. }
Program Explanation

1. Take the string containing both digits and alphabet as input and store it in the array string[].
2. Using for loop and if statement check for the digits in the array. If it is, then increment the variable nc by 1 and increment the variable sum with the current digit.
3. Do the step-2 till the end of the input string.
4. Variable nc gives the count of number of digits in the array and variable sum gives the sum of all the digits in the array.

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Runtime Test Cases
Enter the string containing both digits and alphabet
hello100
NO. of Digits in the string = 3
Sum of all digits = 1

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Here’s the list of Best Reference Books in C Programming, Data-Structures and Algorithms

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If you wish to look at other example programs on Strings, go to C Programming Examples on Strings. If you wish to look at programming examples on all topics, go to C Programming Examples.

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Manish Bhojasia, a technology veteran with 20+ years @ Cisco & Wipro, is Founder and CTO at Sanfoundry. He is Linux Kernel Developer & SAN Architect and is passionate about competency developments in these areas. He lives in Bangalore and delivers focused training sessions to IT professionals in Linux Kernel, Linux Debugging, Linux Device Drivers, Linux Networking, Linux Storage, Advanced C Programming, SAN Storage Technologies, SCSI Internals & Storage Protocols such as iSCSI & Fiber Channel. Stay connected with him @ LinkedIn