求高手指点

float calculateMonthlypayment(float* IM,float* PP, float* NB)
{
     
    float rateM;
    float MP,PR;
    *IM=PR*rateM;                //月利息=本金*月利息
    *PP=MP-IM ;                    //月还本金=月还总额-月利息
    *NB=PR-PP;                    //新本金=本金-月还本金
    return 0;
}

以上是错误的地方，我不知道咋改，
以下是原函数



#include<stdio.h>

#include<math.h>

float printInformation(float PR,float rateY,float MP);
float calculateMonthlypayment(float*IM,float* PP, float* NB);
float printAmortizationTable(float NB,float PR,float IM,float PP);
int main()
{
    float PR,MP,IM,NB,PP,rateY;                    //PR是本金，MP是每月要还的钱，IM是每月要还的利息，PP是要还的本金，rateY是年利率；
    printInformation( PR,rateY,MP);
    calculateMonthlypayment(&IM,&PP,&NB);
    printAmortizationTable(NB,PR,IM, PP);
    return 0;
}
float printInformation(float PR,float rateY,float MP)
{
    int Y,M;                                    //Y;年。M；月；
    float rateM;                                //rateM是月利率；
    printf("the amont of the loan(principal);  ");
    scanf("%f",&PR);
    printf("interest rate/year (percent);  ");
    scanf("%f",&rateY);
    printf("interest rate/month (decimal);  ");
    scanf("%lf",&rateM);
    printf("number of years; ");
    scanf("%d",&Y);
    printf("number of month;  ");
    scanf("%d",&M);
    printf("monthly payment; ");
    scanf("%f", &MP);
    return 0;
}


float calculateMonthlypayment(float* IM,float* PP, float* NB)
{
     
    float rateM;
    float MP,PR;
    *IM=PR*rateM;                //月利息=本金*月利息
    *PP=MP-IM ;                    //月还本金=月还总额-月利息
    *NB=PR-PP;                    //新本金=本金-月还本金
    return 0;
}


float printAmoitizationTable(float PR,float PP,float NB)
{
    int M;
    float IM,MP;
    float sum=0.00;
    printf("            old            month        Interest        principal        new\n");
    printf("month\n");
    printf("            Balanxe        payment          paid              paid            balance\n");
    for(M=1;M<=12;M++)
    {
        printf("%d   %f   %f    %f   %f   %f ",M,PR,MP,IM,PP,NB);
        PR=NB;
        sum=sum+PP;
    }

     printf("total amount paid; %f",&sum);
}