﻿ C : Add numbers except those that begin with a 5 then a 6

# C Exercises: Compute the sum of the numbers in a given array except those numbers starting with 5 followed by atleast one 6

## C-programming basic algorithm: Exercise-53 with Solution

Write a C program to compute the sum of the numbers in a given array except those that begin with 5 followed by at least one 6. Return 0 if the given array has no integers.

C Code:

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

// Function prototype for 'test'
int test(int nums[], int arr_size);

int main(void){
// Declaration and initialization of an integer array 'array1'
int array1[] = {1, 5, 6, 9, 10, 17};

// Calculating the size of the array 'array1'
int arr_size = sizeof(array1)/sizeof(array1);

// Printing a message indicating the purpose of the program
printf("Sum of values in the array of integers except those numbers starting with 5 followed by atleast one 6: ");

// Printing the result of the 'test' function for the array 'array1'
printf("%d",test(array1, arr_size));
}

// Definition of the 'test' function
int test(int nums[], int arr_size)
{
// Declaration of a variable 'sum' to accumulate the sum of values
int sum = 0;

// Declaration of a variable 'inSection' to track if we are inside the section
int inSection = 0;

// Looping through the elements of the array
for (int i = 0; i < arr_size; i++)
{
// Checking if the current element is 5, marking the start of a section
if (nums[i] == 5)
{
inSection = 1;
}
// Checking if the current element is 6, marking the end of a section
else if (inSection && nums[i] == 6)
{
inSection = 0;
}
// Adding the value to 'sum' if it's not part of the section
else if (!inSection)
{
sum += nums[i];
}
}

// Returning the accumulated sum
return sum;
}
``````

Sample Output:

```Sum of values in the array of integers except those numbers starting with 5 followed by atleast one 6: 37
```

Pictorial Presentation: Flowchart: C Programming Code Editor:

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