请教!数据溢出的小问题
本人菜鸟,想请教个有关数据溢出的小问题
short i=32767;
cout<<"i= "<<i<<endl;
i=i+1;
cout<<"i+1= "<<i<<endl;
short i=32767;
cout<<"i= "<<i<<endl;
//i=i+1;
cout<<"i+1= "<<i+1<<endl;
//有符号整形a和b,如何判断a+b是否溢出
#include <stdio.h>
int ifo_add(int a,int b) {
__asm {
mov eax,a
add eax,b
jo overflowed
xor eax,eax
jmp no_overflowed
overflowed:
mov eax,1
no_overflowed:
}
}
int main() {
int a,b;
a= 1;b= 2;printf("%11d+(%2d) %d\n",a,b,ifo_add(a,b));
a= -1;b=-2;printf("%11d+(%2d) %d\n",a,b,ifo_add(a,b));
a= 2147483647;b= 1;printf("%11d+(%2d) %d\n",a,b,ifo_add(a,b));
a=-2147483647;b=-1;printf("%11d+(%2d) %d\n",a,b,ifo_add(a,b));
a=-2147483647;b=-2;printf("%11d+(%2d) %d\n",a,b,ifo_add(a,b));
}
// 1+( 2) 0
// -1+(-2) 0
// 2147483647+( 1) 1
//-2147483647+(-1) 0
//-2147483647+(-2) 1