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。
#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 !!! $
嵌套循环（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: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。
#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 !!! $
嵌套循环（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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