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This document uses PHP Chinese website manual Release
导致封闭 for,while 或 do-while 循环或 switch 语句终止。
当使用条件表达式和条件语句来终止循环时,使用它时很尴尬。
break ; |
---|
仅出现在循环体的语句(while,do,for)内或在 switch 的语句内。
在这个语句之后,控制权会在封闭循环或开关后立即传输到语句或声明中,就像通过 goto 一样。
break
.
break 语句不能用于突破多个嵌套循环。goto 语句可以用于此目的。
#include <stdio.h> int main(void){ int i = 2; switch (i) { case 1: printf("1"); case 2: printf("2"); // i==2, so execution starts at this case label case 3: printf("3"); case 4: case 5: printf("45"); break; // execution of subsequent cases is terminated case 6: printf("6"); } printf("\n"); // Compare outputs from these two nested for loops. for (int j = 0; j < 2; j++) for (int k = 0; k < 5; k++) printf("%d%d ", j,k); printf("\n"); for (int j = 0; j < 2; j++) { for (int k = 0; k < 5; k++) { // only this loop is exited by break if (k == 2) break; printf("%d%d ", j,k); } }}
输出:
234500 01 02 03 04 10 11 12 13 14 00 01 10 11
C11 standard (ISO/IEC 9899:2011):
6.8.6.3 The break statement (p: 153)
C99 standard (ISO/IEC 9899:1999):
6.8.6.3 The break statement (p: 138)
C89/C90 standard (ISO/IEC 9899:1990):
3.6.6.3 The break statement