#include <stdio.h>
#include <math.h>
void main()
{
   
    int a=3;b=4;c=5;u=51274;n=128765;
    float x,y,d,e,f;
    char c1='a';
         c2='b';
    d=x+y;
    e=y+z;
    f=z+x;
    printf("a= %d\tb= %d\tc= %d\n",a,b,c);
    printf("x=%1.6f,y=%1.6f,z=-%1.6f\n",x,y,z);
    printf("x+y= %1.2f\ty+z=%1.2f\tz+x=%1.2f\n",d,e,f);
    printf("u= %d\tn= \t%d\n",u,n);
    printf("c1='%c' or %d",c1,c1);
    printf("c2='%c' or %d",c2,c2);


    printf("%3s,%7.2s,%.4s,%-5.3s\n","China","China","China","China");
}

这个程序是要输出：
a= 3  b= 4  c= 5
x=1.200000,y=2.400000,z=-3.600000
x+y= 3.60  y+z=-1,20  z+x=-2,40
u= 51247  n=   128765
c1='a' or 97
c2='B' or 98
难道不适合用转义字符？改了还是那么多错误