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一步一步写算法(之“数星星”)

 

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    学过编程的朋友都知道,当初为了学习编程语言中的各种语法结构,我们要试着解决各种各样奇怪的题目。其中“数星星”就似乎其中的一种。什么是“数星星”呢?就是打印各种形状的“*”,正三角、倒三角、菱形等等。本篇博客纯粹为了纪念我们逝去的岁月。

 

    a)正三角

 

 

void star_1() 

    int outer; 

    int inner; 

 

    for(outer = 1; outer <10; outer ++){ 

        for(inner = 1; inner <= outer; inner ++){ 

            printf("%c ", '*'); 

        } 

        printf("\n"); 

    } 

void star_1()

{

       int outer;

       int inner;

 

       for(outer = 1; outer <10; outer ++){

              for(inner = 1; inner <= outer; inner ++){

                     printf("%c ", '*');

              }

              printf("\n");

       }

}    b)倒三角

 

 

void star_2() 

    int outer; 

    int inner; 

     

    for(outer = 9; outer >= 1; outer --){ 

        for(inner = 1; inner <= outer; inner ++){ 

            printf("%c ", '*'); 

        } 

        printf("\n"); 

    } 

void star_2()

{

       int outer;

       int inner;

      

       for(outer = 9; outer >= 1; outer --){

              for(inner = 1; inner <= outer; inner ++){

                     printf("%c ", '*');

              }

              printf("\n");

       }

}  c)左三角

 

 

 

void star_3() 

    int outer; 

    int inner; 

     

    for(outer = -4; outer <= 4; outer ++){ 

        for(inner = 1; inner <= (5 - abs(outer)); inner ++){ 

            printf("*"); 

        } 

 

        for(; inner <= 5; inner ++){ 

            printf(" "); 

        } 

 

        printf("\n"); 

    } 

void star_3()

{

       int outer;

       int inner;

      

       for(outer = -4; outer <= 4; outer ++){

              for(inner = 1; inner <= (5 - abs(outer)); inner ++){

                     printf("*");

              }

 

              for(; inner <= 5; inner ++){

                     printf(" ");

              }

 

              printf("\n");

       }

}    d) 右三角

 

 

void star_4() 

    int outer; 

    int inner; 

     

    for(outer = -4; outer <= 4; outer ++){ 

        for(inner = 1; inner <= abs(outer); inner ++){ 

            printf(" "); 

        } 

         

        for(; inner <= 5; inner ++){ 

            printf("*"); 

        } 

         

        printf("\n"); 

    } 

void star_4()

{

       int outer;

       int inner;

      

       for(outer = -4; outer <= 4; outer ++){

              for(inner = 1; inner <= abs(outer); inner ++){

                     printf(" ");

              }

             

              for(; inner <= 5; inner ++){

                 &

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