C - Hình Tam Giác

 

Question:

In C programming language:

This program will output a right triangle based on user specified height triangleHeight and symbol triangleChar.

(1) The given program outputs a fixed-height triangle using a * character. Modify the given program to output a right triangle that instead uses the user-specified triangleChar character. (1 pt)

 

(2) Modify the program to use a nested loop to output a right triangle of height triangleHeight. The first line will have one user-specified character, such as % or *. Each subsequent line will have one additional user-specified character until the number in the triangle's base reaches triangleHeight. Output a space after each user-specified character, including a line's last user-specified character. (2 pts)

 

Example output for triangleChar = % and triangleHeight = 5:

Enter a character: %
Enter triangle height: 5
% 
% % 
% % % 
% % % % 
% % % % % 

#include <stdio.h>

int main(void) {
   char triangleChar = '-';
   int triangleHeight = 0;

   printf("Enter a character: \n");
   scanf("%c", &triangleChar);
   
   printf("Enter triangle height: \n");
   scanf("%d", &triangleHeight);
       
   printf("* \n");
   printf("* * \n");
   printf("* * * \n");
   
   return 0;
}

---

Answer:

#include <stdio.h>

int main(void) {
    char triangleChar;
    int triangleHeight;

    printf("Enter a character:\n");
    scanf(" %c", &triangleChar);

    printf("Enter triangle height:\n");
    scanf("%d", &triangleHeight);
    printf("\n");

    int i, j;
    for(i = 0; i < triangleHeight; ++i) {
        for(j = 0; j <= i; ++j) {
            printf("%c ", triangleChar);
        }
        printf("\n");
    }
    return 0;
}