IRR(Internal Rate of Return)公式

float c,x;
Discount;
float Low=0, High=1;
int n;
scanf("%f",&c);
scanf("%f",&x);
scanf("%d",&n);
while(High-Low>=0.0001){
  float Middle=(Low+High)/2;
  float Value=0;

  for(inti=1;i<=n;i=i+1){
    Discount=1;
    for(intj=1;j<=i;j++){
      Discount=Discount/(1+Middle);
    }
  Value=Value+Discount*c;
  }

  Value=Value-x;
  if(Value>0){ Low=Middle;}else{High=Middle;}
}
printf("Yieldrate=%f",High);