[Error] invalid operands to binary ^ (have ‘double‘ and ‘float‘)

C、C++中不能直接使用^

在C、C++中不能使用^来表示指数,只能用*,如果想使用指数,只能建立循环多次相乘或者直接用乘法写出多个,下面是我的代码,注释部分为原来使用的指数形式,会报以上错误。

或者引用数学函数,在前面加上#include<math.h>;

使用pow(x,y)表示求解x的y次方;

#include <stdio.h>
#include <stdlib.h>
#include <math.h>

/* run this program using the console pauser or add your own getch, system("pause") or input loop */

int main(int argc, char *argv[]) {
	double p0=1000,r1=0.0036,r2=0.0225,r3=0.0198,p1,p2,p3;
	p1=p0*(1+r1)*(1+r1)*(1+r1)*(1+r1)*(1+r1)*(1+r1);
	//p1=p0*(1+r1)^6;
	p2=p0*(1+r2)*(1+r2)*(1+r2);
	//p2=p0*(1+r2)^3;
	p3=p0*(1+r3)*(1+r3);
	//p3=p0*(1+r3)^2;
	double x=1,y=2,p;
	p = pow(x+1,y);  //求x+1的y次方,即为指数 
	printf("1+1的平方为%lf",p);
	printf("存1年期%lf,存2年期%lf,存3年期%lf",p1,p2,p3);
	return 0;
}

a.cpp:35:5: error: extra qualification ‘Stud::’ on member ‘sum’ [-fpermissive] 35 | int Stud::sum=0; | ^~~~ a.cpp:35:15: error: ‘int Stud::sum’ conflicts with a previous declaration 35 | int Stud::sum=0; | ^ a.cpp:15:19: note: previous declaration ‘double Stud::sum’ 15 | static double sum; | ^~~ a.cpp:36:5: error: extra qualification ‘Stud::’ on member ‘num’ [-fpermissive] 36 | int Stud::num=0; | ^~~~ a.cpp:45:2: error: expected ‘}’ at end of input 45 | } | ^ a.cpp:9:12: note: to match this ‘{’ 9 | class Stud { | ^ a.cpp: In member function ‘void Stud::print()’: a.cpp:28:24: error: expected primary-expression before ‘,’ token 28 | cout <<number<<, name<<, score<< endl; | ^ a.cpp:28:32: error: expected primary-expression before ‘,’ token 28 | cout <<number<<, name<<, score<< endl; | ^ a.cpp:28:39: error: invalid operands of types ‘floatand ‘<unresolved overloaded function type>’ to binary ‘operator<<’ 28 | cout <<number<<, name<<, score<< endl; | ~~~~~^~~~~~~ a.cpp: In member function ‘int Stud::main()’: a.cpp:40:8: error: ‘class Stud’ has no member named ‘disp’ 40 | s1.disp(); | ^~~~ a.cpp:41:8: error: ‘class Stud’ has no member named ‘disp’ 41 | s2.disp(); | ^~~~ a.cpp:42:8: error: ‘class Stud’ has no member named ‘disp’ 42 | s3.disp(); | ^~~~ a.cpp:43:25: error: ‘avg’ is not a member of ‘Stud’ 43 | cout<<"avg="<<Stud::avg()<<endl; | ^~~ a.cpp: At global scope: a.cpp:45:2: error: expected unqualified-id at end of input 45 | } | ^
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04-03
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