printf.c

来自「c21Examples.rar」· C语言 代码 · 共 73 行

/* Demonstration of printf(). */

#include <stdio.h>

char *m1 = "Binary";
char *m2 = "Decimal";
char *m3 = "Octal";
char *m4 = "Hexadecimal";

int main( void )
{
    float d1 = 10000.123;
    int n, f;


    puts("Outputting a number with different field widths.\n");

    printf("%5f\n", d1);
    printf("%10f\n", d1);
    printf("%15f\n", d1);
    printf("%20f\n", d1);
    printf("%25f\n", d1);

    puts("\n Press Enter to continue...");
    fflush(stdin);
    getchar();

    puts("\nUse the * field width specifier to obtain field width");
    puts("from a variable in the argument list.\n");

    for (n=5;n<=25; n+=5)
        printf("%*f\n", n, d1);

    puts("\n Press Enter to continue...");
    fflush(stdin);
    getchar();

    puts("\nInclude leading zeros.\n");

    printf("%05f\n", d1);
    printf("%010f\n", d1);
    printf("%015f\n", d1);
    printf("%020f\n", d1);
    printf("%025f\n", d1);

    puts("\n Press Enter to continue...");
    fflush(stdin);
    getchar();

    puts("\nDisplay in octal, decimal, and hexadecimal.");
    puts("Use # to precede octal and hex output with 0 and 0X.");
    puts("Use - to left-justify each value in its field.");
    puts("First display column labels.\n");

    printf("%-15s%-15s%-15s", m2, m3, m4);

    for (n = 1;n< 20; n++)
        printf("\n%-15d%-#15o%-#15X", n, n, n);

    puts("\n Press Enter to continue...");
    fflush(stdin);
    getchar();

    puts("\n\nUse the %n conversion command to count characters.\n");

    printf("%s%s%s%s%n", m1, m2, m3, m4, &n);

    printf("\n\nThe last printf() output %d characters.\n", n);

    return 0;
}