#include <iostream> using namespace std ; int main () { int a , b; cout << " Please input 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 [2]; double b; char c [8]; } x; int main () { x.c [0] = 'G'; x.c [1] = 'O'; x.c [2] = 'O'; x.c [3] = 'D'; x.c [4] = 'B'; x.c [5] = 'A'; x.c [6] = 'B'; x.c [7] = 'Y'; printf ("int : %d byte (s)\n" , sizeof (int )); printf (" double : %d byte (s)\n" , sizeof ( double )); printf (" char : %d byte (s)\n" , sizeof ( char )); // printf (" bool : %d bytes (s)\n" , sizeof ( bool )); printf ("\n"); printf (" integer : %d %d\n" , x.a[0] , x.a [1]); printf (" real number : %e\n" , x.b); printf (" characters : %c%c%c%c%c%c%c%c\n" , x.c[0] , x.c[1] , x.c[2] , x.c[3] , x.c[4] , x.c[5] , x.c[6] , x.c [7]); printf ("HEX : %X%X%X%X%X%X%X%X\n" , x.c[0] , x.c[1] , x.c[2] , x.c[3] , x.c[4] , x.c[5] , x.c[6] , x.c [7]); return 0; } ~