include <stdio.h>

int main()
{

float frequency, time; 

printf("请输入频率: "); 
scanf("%f", &frequency); 

time = 1/frequency; // 计算电源频率的周期

printf("电源频率的周期为：%f 秒  

",time); // 输出计算的时间周期

return 0; 

}