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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