将数字打印到可变小数位数
我想在C中打印一个数字到可变数量的小数位。我已经编写了代码
#include main() { int a; printf("Upto which number of decimal places you want to print value of '2.554648' ?"); scanf("%d", &a); printf("Value of '2.554648 upto %d number of decimal places = %.af", a, 2.554648); return 0; }
在printf()
使用*
来标记您想要的小数位数:
#include int main(void) { int a; printf("Upto which number of decimal places you want to print value of '2.554648' ?"); scanf("%d", &a); printf("Value of '2.554648 upto %d number of decimal places = %.*f", a, a, 2.554648); return 0; }
你需要*
格式说明符。 这是一个简短的例子(参见ideone ):
#include int main(void) { int a = 5; double temp = 5.0 / 7; printf("%.*f",a, temp); return 0; }