php中關於break與continue兩者之間的用法區別

一般說來，程式進入迴圈體後在下次迴圈判斷之前執行迴圈體裡的所有語句，break和continue語句可以終止迴圈或忽略某些迴圈。

break： 此語句導致程式終止包含它的循環，並進行程式的下一階段（整個循環後面的語句），即，不是跳到下一個循環週期而是退出循環。如果break語句包含在巢狀迴圈裡，它只會跳出最裡面的迴圈。

#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 !!!
$

巢狀迴圈（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:迴圈語句裡有此語句時，程式執行到此語句時，不在執行迴圈體裡continue後面的語句而是跳到下一個迴圈入口處執行下一個迴圈。如果continue語句包含在巢狀迴圈語句裡，它只會影響包含它的最裡層的迴圈。

#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 !!!
$

巢狀迴圈（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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