C Examples

WAP in C to read ‘n’ numbers and add them using pointers!

The Program in to read ‘n’ numbers and add them using pointers is given below:

#include <stdio.h>

int main() {
    int n, i;
    int *p, *q, *r;
    int sum = 0;

    printf("Enter the number of integers to be added: ");
    scanf("%d", &n);

    p = (int*) malloc(n * sizeof(int));
    q = p;

    printf("Enter %d integers: \n", n);
    for (i = 0; i < n; i++) {
        scanf("%d", p);
        p++;
    }

    p = q;
    for (i = 0; i < n; i++) {
        sum += *p;
        p++;
    }
    printf("Sum of the integers = %d\n", sum);

    free(q);
    return 0;
}

Output:

Enter the number of integers to be added: 3
Enter 3 integers:
5
8
9
Sum of the integers = 22

Pro-Tips💡

This program uses dynamic memory allocation with the malloc() function to allocate memory for ‘n’ integers.

The variable p is a pointer to the first element of the allocated memory, and q is a copy of p that is used to reset the pointer after input is read.

The scanf() function is used to read the integers, and the pointer p is incremented after each input to move to the next memory location.

The for loop iterates through the integers using the pointer p and adds them to the variable sum. Finally, the sum is printed and the memory is freed using the free() function.

Note that, gets() and scanf() with no width specifier are vulnerable to buffer overflow and should be avoided in any modern C programming.

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