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#include <cstdio>
int main (){
    char c;
    char d;
    int a = 1234;
    float f = 3.141592653589;
    double x = 0.12345678987654321;
    c = '\x41';//十六进制 
    d = '\101';//八进制 
    printf("a = %d\n", a);
    printf("a = %6d\n", a);
    printf("a = %2d\n", a); 
    printf("a = %-6d--\n", a);
    printf("a = %06d\n", a);
    printf("a = %02d\n", a);
    printf("f = %f\n", f);
    printf("f = %6.4f\n", f);
    printf("x = %lf\n", x);
    printf("x = %18.16lf\n", x);
    printf("c = %c\n", c);
    printf("c = %d\n", c);
    printf("c = %x\n", c);
    printf("d = %c\n", d);
    printf("d = %d\n", d);
    printf("d = %x\n", d);
    return 0;
}