sa1605.c

数十个C语言的代码

#include <stdio.h>

void main()  /* 比较 */
{
   int x = 11,y = 11,z = 11;
   char a = 40,b = 40,c = 40;
   float r = 12.987,s = 12.987,t = 12.987;

   /* 第一组比较指令*/
   if (x == y)
     z = -13;   /*  z = -13 */
   if (x > z)
     a = 'A';   /*  a = 65  */
   if (!(x > z))
     a = 'B'; /* 无改变 */
   if (b <= c)
     r = 0.0;   /* r = 0.0 */
   if (r != s)
     t = c/2;   /* t = 20  */
   printf("z=%d,a=%d,a=%d,r=%f,t=%d\n",z,a,a,r,t);
   printf("\n");
   getch();

   /* 第二组比较指令*/
   if (x=(r!=s))
     z=1000; /* z = 1000 */
   printf("x=%d,z=%d\n",x,z);

   if (x=y)
     z=222;   /* x = y, z = 222 */
   printf("z=%d\n",z);

   if (x!= 0)
     z=333;  /* z = 333 */
   printf("z=%d\n",z);

   if (x)
     z=444;       /* z = 444 */
   printf("z=%d\n",z);
   printf("\n");
   getch();

   /* 第三组比较指令*/
   x=y=z=77;
   if ((x == y) && (x == 77))
   z = 33; /* z = 33 */
     printf("z=%d\n",z);

   if ((x > y) || (z > 12))
     z = 22; /* z = 22 */
     printf("z=%d\n",z);

   if (x && y && z) 
     z = 11;  /* z = 11 */
   printf("z=%d\n",z);

   if ((x = 1) && (y = 2) && (z = 3))
     r = 12.00; /* x = 1, y = 2, z = 3, r = 12.00 */
   printf("r=%d\n",r);

   if ((x == 2) && (y = 3) && (z = 4))
     r = 14.56; /*无变化 */
   printf("r=%d\n",r);
   printf("\n");
   getch();

   /* 第四组比较指令*/
   if (x == x);
   z = 27.345;  /*z变化*/
   printf("z=%d\n",z);

   if (x!=x)
     z=27.345;  /* 不变*/
   printf("z=%d\n",z);

   if (x=0)
     z = 27.345;  /* x = 0, z 不变 */
   printf("z=%d\n",z);
}