返回:贺老师课程教学链接
请写出下面程序的运行结果或说明其功能,通过运行程序进行对照
(1)
#include <stdio.h> #define DEBUG int main() { #ifdef DEBUG printf("Debugging\n"); #else printf("Not debugging\n"); #endif printf("Running\n"); return 0; }(2)
#include <stdio.h> #define DEBUG 0 int main() { #ifdef DEBUG printf("Debugging\n"); #else printf("Not debugging\n"); #endif printf("Running\n"); return 0; }(3)
#include <stdio.h> #define TWO int main() { #ifdef ONE printf("1\n"); #elif defined TWO printf("2\n"); #else printf("3\n"); #endif return 0; }(4)
#include <stdio.h> #include <malloc.h> #define NUM ok int main(void) { struct stu { int num; char *name; char sex; float score; } *ps; ps=(struct stu*)malloc(sizeof(struct stu)); ps->num=102; ps->name="Zhang ping"; ps->sex='M'; ps->score=62.5; #ifdef NUM printf("Number=%d\nScore=%f\n",ps->num,ps->score); #else printf("Name=%s\nSex=%c\n",ps->name,ps->sex); #endif free(ps); return 0; }(5)
#include <stdio.h> #define LETTER 1 int main( ) { int i=0; static char str[ ]= { "Turbo C Program"}; char c; while ((c=str[i]) != '\0') { i++; # if LETTER if (c>='a' && c<='z') c=c-32; # else if (c>='A' && c<='Z') c=c+32; # endif printf("%c",c); } return 0; }
