Question

C programing
Write a function that takes an array of integers and applies another function (f(x)= 3x+4) on each element and then stores the result in another array and finally return it once it is done.

Answer 1

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

int *modify_array(int *arr, int size);

int main() {
    int arr[] = {4, 9, 1, 2, 5}, size = 5, i;
    int *result = modify_array(arr, size);
    for (i = 0; i < size; ++i) {
        printf("%d ", arr[i]);
    }
    printf("\n");
    for (i = 0; i < size; ++i) {
        printf("%d ", result[i]);
    }
    printf("\n");
    free(result);
    return 0;
}

int *modify_array(int *arr, int size) {
    int *result = (int *) malloc(sizeof(int) * size), i;
    for (i = 0; i < size; ++i) {
        result[i] = 3 * arr[i] + 4;
    }
    return result;
}