C 中的 %d 和 %lf 有什么区别？

Question

对于 c 中的 peintf，%d 和 %lf 有什么区别

printf("Value of n is %d\n", n);
printf("Value of x is %lf\n", x);

Answer 1

对于*printf,

%d 用于将 int 类型的值包含为十进制数。

%lf 是在 C99 中引入的，作为现有 %f.

的别名

%f 用于在样式 [-]ddd.ddd.

中以十进制表示法包含类型 double 的值

cppreference.com 很棒 printf reference.

用法示例：

int         a_signed_int   = ...;
signed char a_signed_char  = ...;
short       a_signed_short = ...;

double      a_double       = ...;
float       a_float        = ...;

printf("%d\n", a_signed_int);
printf("%d\n", a_signed_char);    // `signed char`s are promoted to `signed int`s
printf("%d\n", a_signed_short);   // Same for `signed short int`s

printf("%f\n", a_double);
printf("%f\n", a_float);          // `float`s are promoted to `double`s

printf("%lf\n", a_double );       // Same as above.
printf("%lf\n", a_float);         // Same as above.

C 中的 %d 和 %lf 有什么区别？

what's the difference between %d and %lf in C?

c

printf