c - printf 动态长度/大小

Question

我正在尝试为 lcd 创建动态 printf 大小，但它仅输出 f= 我做错了什么？

sprintf(buffer, "f=%.2f",  (d = d + 0.01)); <-- works but not dynamic 

sprintf(buffer, "f=%.*f", 2 , (d = d + 0.01));  <-- Does not any give warning

lcd_puts(buffer);


_delay_ms(100);

Answer 1

可能你需要这个:

char format[10];int len1 = 5, len2 = 2;sprintf(format, "f=%%%d.%df", len1, len2);sprintf(buffer, format , (d = d + 0.01));