C Exercises: Sum of all numerical values (positive integers) embedded in a sentence

Last update on September 19 2025 12:44:57 (UTC/GMT +8 hours)

Sum numerical values embedded in a sentence

Write a C program to sum all numerical values (positive integers) embedded in a sentence.

Input:
Sentences with positive integers are given over multiple lines. Each line is a character string containing one-byte alphanumeric characters, symbols, spaces, or an empty line. However the input is 80 characters or less per line and the sum is 10,000 or less

Sample Solution:

C Code:

#include <stdio.h>
#include <stdlib.h>

// Define a character array to store text
char text[128];

int main(void) {
  int i, j, k;
  int result = 0;
  char temp[8];

  // Prompt user to input sentences with positive integers
  printf("Input Sentences with positive integers:\n");

  // Read user input into the 'text' array
  scanf("%s", text);

  i = 0;
  while (text[i]) {
    // Loop through characters until a digit is found
    for (; (text[i] < '0' || '9' < text[i]) && text[i]; i++);

    if ('0' <= text[i] && text[i] <= '9') {
      // Extract and store the numerical value in 'temp'
      for (j = 0; '0' <= text[i] && text[i] <= '9'; j++, i++) {
        temp[j] = text[i];
      }

      temp[j] = '\0';
      // Convert 'temp' to an integer and add it to 'result'
      result += atoi(temp);
    }
  }

  // Print the sum of all numerical values embedded in the sentence
  printf("\nSum of all numerical values embedded in a sentence:\n");
  printf("%d\n", result);

  return 0;
}

Sample Output:

Input Sentences with positive integers:
5littleJackand2mouse.

Sum of all numerical values embedded in a sentence:
7

Flowchart:

C Programming Flowchart: Sum of all numerical values (positive integers) embedded in a sentence.

For more Practice: Solve these Related Problems:

Write a C program to scan a sentence and extract all integers, then compute their sum using character parsing.
Write a C program to use pointer arithmetic to traverse a string and sum embedded numerical values.
Write a C program to implement a function that identifies and sums all numeric substrings within a given sentence.
Write a C program to parse a sentence for digits, convert them to integers, and accumulate their total using loops.

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