break与continue的用法区别

一般说来，程序进入循环体后在下次循环判断之前执行循环体里的所有语句，break和continue语句可以终止循环或忽略某些循环。

break： 此语句导致程序终止包含它的循环，并进行程序的下一阶段（整个循环后面的语句），即，不是跳到下一个循环周期而是退出循环。如果break语句包含在嵌套循环里，它只跳出最里面的循环。

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#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;

}

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$ 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 !!!

$

嵌套循环（break）：

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#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;

}

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$ 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:循环语句里有此语句时，程序运行到此语句时，不在执行循环体里continue后面的语句而是跳到下一个循环入口处执行下一个循环。如果continue语句包含在嵌套循环语句里，它只影响包含它的最里层的循环。

[cpp] view
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#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;

}

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$ 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 !!!

$

嵌套循环（continue）：

[cpp] view
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#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;

}

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$ 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 !!!

$