功能：类型修饰符long和unsigned的使用

#include<stdio.h>

main()

{ 

    char a1,b1;

    unsigned char a2,b2;

    int x1,y1;

    long x2,y2;

     a1=127;    b1=129;

     a2=127;    b2=129;

    x1=32767;   y1=32769;

    x2=32767;   y2=32769;

    printf("a1=%d,a2=%u,b1=%d,b2=%u\n",a1,a2,b1,b2);

    printf("x1=%d,x2=%u,y1=%d,y2=%u\n",x1,x2,y1,y2);

}

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