用C语言画三角形

【最简单】

/*

Write a program in C to display the pattern like right angle triangle using asterisk.

*/

#include <stdio.h>

 

int main()

{

     int i, j, rows;

    

     printf("Input number of rows:");

     scanf("%d",&rows);

    

     for(i = 1;i <= rows;i++)

     {

            for(j = 1;j <= i;j++)

            {

                   printf("*");

            }

            printf("\n");

     }

    

     return 0;

}

 

 

计算流程图：

 

 

输出结果：

 

 

 

【升级版】

/*

Write a program in C to make such a pattern like right angle triangle with number which will repeat a number in a row.

*/

 

#include <stdio.h>

 

int main()

{

     int i, j, rows;

    

     printf("Input number of rows:");

     scanf("%d",&rows);

    

     for(i = 1;i <= rows;i++)

     {

            for(j = 1;j <= i;j++)

            {

                   printf("%d",j);

            }

            printf("\n");

     }

    

     return 0;

}

 

输出结果：

 

 

 

【升级】

/*

Write a program in C to make such a pattern like right angle triangle with number which will repeat a number in a row.

*/

 

#include <stdio.h>

 

int main()

{

     int i, j, rows;

    

     printf("Input number of rows:");

     scanf("%d",&rows);

    

     for(i = 1;i <= rows;i++)

     {

            for(j = 1;j <= i;j++)

            {

                   printf("%d",i);

            }

            printf("\n");

     }

    

     return 0;

}

 

输出结果：

 

 

【再升级】

/*

Write a program in C to make such a pattern like right angle triangle with number increased by 1.

*/

#include <stdio.h>

int main()

{

     int i, j, rows, k = 1;

    

     printf("Input number of rows:");

     scanf("%d",&rows);

    

     for(i = 1;i <= rows;i++)

     {

            for(j = 1;j <= i;j++)

            {

                   printf("%d",k++);

            }

            printf("\n");

     }

    

     return 0;

}

 

 

流程图：

 

 

打印结果：

 

 

【升级】

/*

Write a program in C to make such a pattern like pyramid with numbers increased by 1.

*/

#include <stdio.h>    

int main() 

{ 

   int i,j,spc,rows,k,t=1; 

   printf("input number of rows : "); 

   scanf("%d",&rows); 

   spc=rows+4-1; 

   for(i=1;i<=rows;i++) 

   { 

      for(k=spc;k>=1;k--) 

            { 

              printf(" "); 

            } 

     for(j=1;j<=i;j++){

            printf("%d ",t++);

     } 

    printf("\n"); 

    spc--; 

   }

     return 0;

} 

 

 

流程图：

 

打印结果：

 

 

 

【升级】

/*

Write a program in C to make such a pattern like pyramid with asterisk.

*/

#include <stdio.h> 

 

int main() 

{ 

   int i,j,spc,rows,k; 

   printf("input number of rows : "); 

   scanf("%d",&rows); 

   spc=rows+4-1; 

   for(i=1;i<=rows;i++) 

   { 

      for(k=spc;k>=1;k--) 

            { 

              printf(" "); 

            } 

     for(j=1;j<=i;j++){

            printf("* ");

     } 

      

    printf("\n"); 

    spc--; 

   }
    return 0;

} 

 

打印结果：