#include <iostream>
#include <cassert>
using namespace std;
int main()
{
int i = 1;
assert(i == 65);
cout << "Hello world" << endl;
return 0;
} 1 调试 2 我们可以利用它在某个程序里的关键假设不成立时,立刻停止该程序的执行并报错,从而避免更严重的错误
#include <iostream>
#include<climits>
using namespace std;
unsigned long getFact(unsigned short num) throw (const char*);
unsigned long getFact(unsigned short num) throw (const char*)
{
unsigned long sum = 1;
unsigned long max = ULONG_MAX;
for ( int i=1; i<=num; i++)
{
sum *= i;
max /= i;
}
if ( max < 1)
{
throw "too big data!!! ";
}
else
{
return sum;
}
}
int main()
{
try
{
unsigned short num = 13;
unsigned long fac = getFact(num);
cout << num << "!=" << fac << endl;
}
catch(const char *e)
{
cout << e << endl;
}
return 0;
}
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