04_01_1.cpp

一个C语言词法分析器,一般本科生课程设计都用得上

#include "stdio.h"
#include "math.h"
float y,f,p1,p2,p3,x;
void main(){
    printf ( "please input x: ");
    scanf("%f",&x);
    f=sin(x+x)/log(x*0.3);
    p1=(f+sin(x))/exp(x);
    f=sin((x+5)+x)/log((x+5)*0.3);
    p2=(f+sin(x+5))/exp(x+5);
    f=sin((x+2)+x)/log((x+2)*0.3);
    p3=(f+sin(x+2))/exp(x+2);
    y=(p1*p1+log(5))/(p2-abs(x))*p3;
    printf ("y(x)=%f\n",y);
}