Populate an array where each element is triple the previous

Last update on March 18 2025 13:30:26 (UTC/GMT +8 hours)

C Practice Exercise

Write a C program to read and print the elements of an array with length 7. Before printing, insert the triple of the previous position, starting from the second position.
For example, if the first number is 2, the array numbers must be 2, 6, 18, 54 and 162

Sample Solution:

C Code:

#include <stdio.h>
int main() {
    int n[5], i, x;
    
    // Input the first number of the array
    printf("Input the first number of the array:\n");
    scanf("%d", &x);
    
    // Fill the array with values based on the input
    for(i = 0; i < 5; i++) {
        n[i] = x;
        x = 3 * x;
    }

    // Print the array values
    for(i = 0; i < 5; i++) {
        printf("n[%d] = %d\n", i, n[i]);
    }
    
    return 0;
}

Sample Output:

Input the first number of the array:                                   
5                                                                      
n[0] = 5                                                               
n[1] = 15                                                              
n[2] = 45                                                              
n[3] = 135                                                             
n[4] = 405

Flowchart:

For more Practice: Solve these Related Problems:

• Write a C program to populate an array where each element is double the value of the previous element.
• Write a C program to fill an array with the Fibonacci sequence starting from two initial numbers.
• Write a C program to populate an array where each element is the sum of the two preceding elements.
• Write a C program to populate an array where each element is the square of the previous element, starting from an initial value.

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