c++的helloworld
helloworld#include <iostream>using namespace std ;int main (){ int a , b; cout << " Pleaseinput two numbers :"; cin >> a >> b; cout << a << "+" << b << "=" << a + b << endl ; return 0;}
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直接输入和输出到文件
#include <iostream>#include <fstream>using namespace std;ifstream fin ("sum.in");ofstream fout ("sum.out ");int main (){ int a , b; fin >> a >> b; fout << a + b << endl ; return 0;}
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#include <stdio.h>union { int a ; double b; char c ;} x;int main (){ x.c = 'G'; x.c = 'O'; x.c = 'O'; x.c = 'D'; x.c = 'B'; x.c = 'A'; x.c = 'B'; x.c = 'Y'; printf ("int : %dbyte (s)\n" , sizeof (int )); printf (" double : %dbyte (s)\n" , sizeof ( double )); printf (" char : %dbyte (s)\n" , sizeof ( char )); // printf (" bool : %dbytes (s)\n" , sizeof ( bool )); printf ("\n"); printf (" integer : %d %d\n" , x.a , x.a ); printf (" real number : %e\n" , x.b); printf (" characters : %c%c%c%c%c%c%c%c\n" , x.c , x.c , x.c , x.c , x.c , x.c , x.c , x.c ); printf ("HEX : %X%X%X%X%X%X%X%X\n" , x.c , x.c , x.c , x.c , x.c , x.c , x.c , x.c ); return 0;}~
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