Generally speaking, after the program enters the loop body, all statements in the loop body will be executed before the next loop judgment. The break and continue statements can terminate the loop or ignore certain loops.
break: This statement causes the program to terminate the loop containing it and proceed to the next phase of the program (the statement following the entire loop), i.e., instead of jumping to The next loop cycle will exit the loop instead. If the break statement is contained in a nested loop, it only breaks out of the innermost loop.
#include<stdio.h> int main() { int res=0; int i=0; int n=0; printf("test break and continue\n"); for(i=0;i<6;i++) { printf("start...\n"); if(i==3) { printf("break \n"); break; printf("break after\n"); //printf("continue \n"); //continue; //printf("continue after\n"); } printf("now i = %d\n",i); } printf("test over !!!\n"); return 0; }
$ gcc -o bc bc.c $ ./bc test break and continue start... now i = 0 start... now i = 1 start... now i = 2 start... break test over !!! $
Nested loop (break) :
#include<stdio.h> int main() { int res=0; int i=0; int n=0; printf("test break and continue\n"); for(i=0;i<6;i++) { printf("start...\n"); for(n=0;n<6;n++) { if(n==3) { printf("break \n"); break; //printf("continue \n"); //continue; } printf("now n= %d\n",n); } if(i==3) { printf("break \n"); break; printf("break after\n"); //printf("continue \n"); //continue; //printf("continue after\n"); } printf("now i = %d\n",i); } printf("test over !!!\n"); return 0; }
$ gcc -o bc bc.c $ ./bc test break and continue start... now n= 0 now n= 1 now n= 2 break now i = 0 start... now n= 0 now n= 1 now n= 2 break now i = 1 start... now n= 0 now n= 1 now n= 2 break now i = 2 start... now n= 0 now n= 1 now n= 2 break break test over !!! $
continue:When there is this statement in the loop statement, when the program runs to this statement, Instead of executing the statement after continue in the loop body, it jumps to the next loop entrance to execute the next loop. If a continue statement is contained within a nested loop, it only affects the innermost loop that contains it.
#include<stdio.h> int main() { int res=0; int i=0; int n=0; printf("test break and continue\n"); for(i=0;i<6;i++) { printf("start...\n"); if(i==3) { //printf("break \n"); //break; //printf("break after\n"); printf("continue \n"); continue; printf("continue after\n"); } printf("now i = %d\n",i); } printf("test over !!!\n"); return 0; }
$ gcc -o bc bc.c $ ./bc test break and continue start... now i = 0 start... now i = 1 start... now i = 2 start... continue start... now i = 4 start... now i = 5 test over !!! $
Nested loop (continue):
#include<stdio.h> int main() { int res=0; int i=0; int n=0; printf("test break and continue\n"); for(i=0;i<6;i++) { printf("start...\n"); for(n=0;n<6;n++) { if(n==3) { //printf("break \n"); //break; printf("continue \n"); continue; } printf("now n= %d\n",n); } if(i==3) { //printf("break \n"); //break; //printf("break after\n"); printf("continue \n"); continue; printf("continue after\n"); } printf("now i = %d\n",i); } printf("test over !!!\n"); return 0; }
$ gcc -o bc bc.c $ ./bc test break and continue start... now n= 0 now n= 1 now n= 2 continue now n= 4 now n= 5 now i = 0 start... now n= 0 now n= 1 now n= 2 continue now n= 4 now n= 5 now i = 1 start... now n= 0 now n= 1 now n= 2 continue now n= 4 now n= 5 now i = 2 start... now n= 0 now n= 1 now n= 2 continue now n= 4 now n= 5 continue start... now n= 0 now n= 1 now n= 2 continue now n= 4 now n= 5 now i = 4 start... now n= 0 now n= 1 now n= 2 continue now n= 4 now n= 5 now i = 5 test over !!! $
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实现方法:1、使用“sleep(延迟秒数)”语句,可延迟执行函数若干秒;2、使用“time_nanosleep(延迟秒数,延迟纳秒数)”语句,可延迟执行函数若干秒和纳秒;3、使用“time_sleep_until(time()+7)”语句。

php除以100保留两位小数的方法:1、利用“/”运算符进行除法运算,语法“数值 / 100”;2、使用“number_format(除法结果, 2)”或“sprintf("%.2f",除法结果)”语句进行四舍五入的处理值,并保留两位小数。

判断方法:1、使用“strtotime("年-月-日")”语句将给定的年月日转换为时间戳格式;2、用“date("z",时间戳)+1”语句计算指定时间戳是一年的第几天。date()返回的天数是从0开始计算的,因此真实天数需要在此基础上加1。

php字符串有下标。在PHP中,下标不仅可以应用于数组和对象,还可应用于字符串,利用字符串的下标和中括号“[]”可以访问指定索引位置的字符,并对该字符进行读写,语法“字符串名[下标值]”;字符串的下标值(索引值)只能是整数类型,起始值为0。

php判断有没有小数点的方法:1、使用“strpos(数字字符串,'.')”语法,如果返回小数点在字符串中第一次出现的位置,则有小数点;2、使用“strrpos(数字字符串,'.')”语句,如果返回小数点在字符串中最后一次出现的位置,则有。

在php中,可以使用substr()函数来读取字符串后几个字符,只需要将该函数的第二个参数设置为负值,第三个参数省略即可;语法为“substr(字符串,-n)”,表示读取从字符串结尾处向前数第n个字符开始,直到字符串结尾的全部字符。

查找方法:1、用strpos(),语法“strpos("字符串值","查找子串")+1”;2、用stripos(),语法“strpos("字符串值","查找子串")+1”。因为字符串是从0开始计数的,因此两个函数获取的位置需要进行加1处理。


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