printf動態長度/大小

Question

我想爲液晶顯示器創建一個動態的printf大小，但它只輸出f =我做錯了什麼？

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

也許你需要這個：

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