关于浮点数
程序代码:
// printfdemo.c-- printf()函数用法示例 #include <stdio.h> char *m1 = "Binary"; char *m2 = "Decimal"; char *m3 = "Octal"; char *m4 = "Hexadecimal"; int main(void) { float d1 = 10000.123; int n; 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 %*f\n", d1, 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("\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; }
可以把这个程序复制粘贴到编译器中……原本的10000.123后面怎么多了047?
(这回我真的没有抄错程序……)