c语言中两个for语句的是怎样循环的

Question

如题所述

Answer 1

比如

for(i = 0; i < 5; i++)
    for(j = 0; j < 5; j++)
        printf("i = %d, j = %d\n", i, j);

先执行i=0，读取i<5的逻辑值为1，则为真，再开始内层循环。内层从j=0一直到j=4循环一整遍之后再执行i++，然后i=1<5，再把内层从j=0一直到j=4循环一整遍，如此循环。

执行结果如下（Code::blocks）

i = 0, j = 0

i = 0, j = 1

i = 0, j = 2

i = 0, j = 3

i = 0, j = 4

i = 1, j = 0

i = 1, j = 1

i = 1, j = 2

i = 1, j = 3

i = 1, j = 4

i = 2, j = 0

i = 2, j = 1

i = 2, j = 2

i = 2, j = 3

i = 2, j = 4

i = 3, j = 0

i = 3, j = 1

i = 3, j = 2

i = 3, j = 3

i = 3, j = 4

i = 4, j = 0

i = 4, j = 1

i = 4, j = 2

i = 4, j = 3

i = 4, j = 4

Process returned 0 (0x0)   execution time : 0.113 s

Press any key to continue.

Answer 2

进入外层循环后，
再进入内层循环。
退出内层循环后，进入外层下一次循环。