This program outputs a downwards facing arrow composed of a rectangle and a right triangle. The arrow dimensions are defined by user specified arrow base height, arrow base width, and arrow head width. #include int main(void) {int arrowBaseHeight = 0;int arrowBaseWidth = 0;int arrowHeadWidth = 0;printf("Enter arrow base height:\n");scanf("%d", &arrowBaseHeight);printf("Enter arrow base width:\n");scanf("%d", &arrowBaseWidth);printf("Enter arrow head width:\n");scanf("%d", &arrowHeadWidth);printf("\n");// Draw arrow base (height = 3, width = 2)printf( "**\n");printf( "**\n");printf( "**\n");// Draw arrow head (width = 4)printf( "****\n");printf( "***\n");printf( "**\n");printf( "*\n");return 0;}a. Modify the given program to use a loop to output an arrow base of height arrow_base_height. b. Modify the given program to use a loop to output an arrow base of width arrow_base_width.c. Modify the given program to use a loop to output an arrow head of width arrow_head_width.

Answer:

Here is the C program:

#include <stdio.h>  //to use input output functions

int main(void) {   //start of main function

 int arrowBaseHeight = 0;  //stores value for arrow base height

int  arrowBaseWidth = 0;  //stores value for arrow base width

 int arrowHeadWidth = 0 ;  //stores value for arrow head width

 int i, j;  //to traverse through the rows and columns

 printf("Enter arrow base height:\n");  //prompts user to enter arrow base height value

 scanf("%d", &arrowBaseHeight);  //reads input value of arrow base height

 printf("Enter arrow base width:\n");  //prompts user to enter arrow base width value

 scanf("%d", &arrowBaseWidth);  //reads input value of arrow base width

 while (arrowHeadWidth <= arrowBaseWidth)  {   //iterates as long as the value of arrowHeadWidth is less than or equals to the value of arrowBaseWidth  

     printf("Enter arrow head width:\n");   //prompts user to enter arrow head width value

     scanf("%d", &arrowHeadWidth);   //reads input value of arrow head width

     printf("\n"); }

 for (i = 0; i < arrowBaseHeight; i++)    {   //iterates through rows

     for (j = 0; j < arrowBaseWidth; j++)  {   //iterates through columns

         printf("*");       }   //prints asterisks

     printf("\n");   }   //prints a new line

 for (i = arrowHeadWidth; i > 0; i--)    {   //loop for input length

     for (j = i; j > 0; j--)        {   //iterates for triangle ( to make arrow head)

         printf("*");       }   //prints asterisks

     printf("\n");   }  } //prints new line

Explanation:

The program asks to enter the height of the arrow base, width of the arrow base and the width of arrow head. When asking to enter the width of the arrow head, a condition is checked that the arrow head width arrowHeadWidth should be less than or equal to width of arrow base arrowBaseWidth. The while loop keeps iterating until the user enters the arrow head width larger than the value of arrow base width.  

The loop is used to output an arrow base of height arrowBaseHeight.

The nested loop is being used which as a whole outputs an arrow base of width arrowBaseWidth. The inner loop draws the stars and forms the base width of the arrow, and the outer loop iterates a number of times equal to the height of the arrow.

The last nested loop is used to output an arrow head of width arrowHeadWidth. The inner loop forms the arrow head and prints the stars needed to form an arrow head.  

The screenshot of output is attached.

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