printf浮点值的字符串格式

Question

我有一个关于使用printf的问题.

char str[8];
float val = 2.334563;
sprintf(str, format, val);
printf("val = %s.\n", str);

val = -23.34563;
sprintf(str, format, val);
printf("val = %s.\n", str);

val = -0.02334563;
sprintf(str, format, val);
printf("val = %s.\n", str);

val = 233;
sprintf(str, format, val);
printf("val = %s.\n", str);

预期的产出如下:

val = +2.3345
val = -23.345
val = -0.0233
val = +233.00

我需要什么格式字符串？感谢您的关注.

Answer 1

老好人怎么了%f