程序说明

打印左右箭头图案

算法

接受打印左右箭头图案的行数.

Print Upper Part of the Arrow with Stars Patterns
Print Inverted Right Triangle with Stars Patterns
Print Bottom Part of the Arrow with Stars Patterns
Print the Right Triangle with Stars Patterns

示例

/*Program to print the Left and right arrow pattern*/
#include<stdio.h>
int main() {
   int r, c, rows; //Left Arrow Pattern
   int r1, c1, rows1; //Right Arrow Pattern
   clrscr();
   printf("Enter number of rows to print the Left Arrow Pattern: ");
   scanf("%d", &rows);
   printf("
");
   printf("The Left Arrow Pattern is:");
   printf("
");
   for(r=1; r<rows; r++){
      for(c=1; c<=(rows-r); c++){
         printf(" ");
      }
      for(c=r;c<=rows; c++){
         printf("*");
      }
      printf("
");
   }
   for(r=1; r<=rows; r++){
      for(c=1; c<r; c++){
         printf(" ");
      }
      for(c=1; c<=r; c++){
         printf("*");
      }
      printf("
");
   }
   printf("Enter number of rows to print the Right Arrow Pattern: ");
   scanf("%d", &rows1);
   printf("
");
   printf("The Right Arrow Pattern is:");
   printf("
");
   for(r1=1; r1<rows1; r1++){
      for(c1=1; c1<=(2*r1-2); c1++){
         printf(" ");
      }
      for(c1=r1; c1<=rows1; c1++){
         printf("*");
      }
      printf("
");
   }
   for(r1=1; r1<=rows1; r1++){
      for(c1=1; c1<=(2*rows1 - 2*r1); c1++){
         printf(" ");
      }
      for(c1=1; c1<=r1; c1++){
         printf("*");
      }
      printf("
");
   }
   getch();
   return 0;
}

输出