在划线处________填写适当内容完成程序。本程序当输入字符是数字时输出字符串 “number”，否则输出“none”#include "stdio.h"int check_number(char x){if ((x >= '0') && (x <= '9'))return 1;else return 0;}int main(void){ char ch;while(1){ scanf("%c", &ch);if(ch=='#') break;if(________)printf("number\n");elseprintf("none\n");}return 0;}

A. check_number(!ch)
B. check_number(ch + 1)
C. !check_number(ch)
D. check_number(ch)

下列程序的输出结果是________。#include void fun(int x, int y) { x = x + y; y = x - y; x = x - y;} int main(void) { int x = 2, y = 3; fun(x, y); printf("%d#%d\n", x, y); return 0; }

下列程序的输出结果是________。#include int a, b; void fun(void) { a = 100; b = 200; } int main(void) { int a = 5, b = 7; fun(); printf("%d#%d\n", a, b); return 0; }

下列程序的输出结果是________。#include int a = 3; int main(void) { int s = 0; { int a = 5; s += a++; } s += a++; printf("%d\n", s); return 0; }

下列程序的输出结果是________。#include int b = 40; void f() { int a = 5; static int b = 5; ++a; ++b; printf("%d%d ", a, b);} int main(void) { f(); f(); return 0; }

下列程序的输出结果是________。#include int f(int n){ if(n == 1) return 1; else return n + f(n - 1); } int main(void) { printf("%d\n", f(5)); return 0; }

下列程序的输出结果是________。#include #define M 3 #define N M + 1 #define NN N * N / 2 int main(void) { printf("%d\n", NN); return 0; }

下列程序的输出结果是________。#include #define PI 3.14 #define S(x) PI * x * x int main(void) { int a = 2; printf("%.1f\n", 6.28 / S(a)); return 0;}

下列程序的输出结果是________。#include"stdio.h"#define N 10void f(void);int main(void){f();#ifdef N#undef N#endifreturn 0;}void f(void){#if defined(N)printf("N is %d\n", N);#elseprintf("N is undefined\n");#endif}

若有以下程序，函数 maxCommonFactor 利用欧几里德算法（辗转相除法）计算两个正 整数的最大公约数。1#include 2 int maxCommonFactor(int a, int b); 3 int main(void) { 4 int a, b, x; 5 printf("Input a, b:"); 6 scanf("%d%d", a, b); 7 x = maxCommonFactor(a,b); 8 printf("MaxCommonFactor=%d\n", x); 9 } 10 int maxCommonFactor(int a, int b) { 11 int r; 12 do { 13 r = a % b; 14 a = b; 15 b = r; 16 } while(r != 0); 17 return a; 18 }程序中存在的错误在第________行。