我在通过C地址时取平均值时遇到了麻烦

所以下面是我的代码的主要部分。 我正在使用一些外部文件。 在function3.6中，我无法获得我的（在这种情况下）总薪酬（pr）和我的总员工（empCount）的平均值。 这里有什么我想念的吗？ 当我编译它时，我得到一个错误，表示无效的操作数。 当我解决这些问题时，我的输出为0.我对编程很新，所以当我试着回答任何问题时请耐心等待。 我遇到问题的函数是代码中倒数第二个函数（3.6 AddDetailToAccumulator）。 非常感谢。

#include  #include  #include "EmployeeRecord.h" #include "CalcTaxes.o" #define ADDR(var) &var #define REPORTCOLUMNHEADINGS1 "Employee Pay Reg Hrs Gross Fed SSI Net\n" #define REPORTCOLUMNHEADINGS2 "Name Rate OVT Hrs Pay State Defr Pay\n" #define BARS "======== ===== ======= ======= ====== ====== =======\n\n" #define REPORTCOLUMN1 "%s, %s\t%8.2f%8.2f%10.2f%8.2f%8.2f%9.2f\n" #define REPORTCOLUMN2 "%32.2f%18.2f%8.2f\n\n" void PrintReportHeadings(FILE * ReportFile); //3.1 void InputEmployeeData(int count,char * lastname,char * firstname,float * hours,float * payrate,float * defr); //3.3 float CalculateGross(float hours, float payrate, float reghours, float ovthours); //3.4 CalculateGross extern void CalculateTaxes(float gross, float defr, float *ft, float *st, float *ssit); //3.5 CalculateTaxes void AddDetailToAccumulator(int count,int *empCount,float *pr,float *payrate,float *reg,float *reghours,float *ovt,float *ovthours,float *gp, float *gross,float *fedt,float *ft,float *stt,float *st,float *sst,float *ssit,float *def, float *defr,float *np,float *net,float *avgpr);//3.6 AddDetailToAccumulator void PrintSummaryReport(float pr,float reg,float ovt,float gp,float fedt,float stt,float sst,float def,float np,float *avgpr,float avgreg,float avgovt, float avggp,float avgfedt,float avgstt,float avgsst,float avgdef,float avgnp,FILE * ReportFile); //3.7 int main() { EmployeeRecord r; // Call Employee Record Definitions float reghours,ovthours; float ft,st,ssit; float pr,reg,ovt,gp,fedt,stt,sst,def,np; float avgpr,avgreg,avgovt,avggp,avgfedt,avgstt,avgsst,avgdef,avgnp; char answer; int empCount,count; FILE * ReportFile; PrintReportHeadings(ReportFile); //Call 3.1 PrintReportHeadings empCount = 0;// count initializations pr = reg = ovt = gp = fedt = stt = def = sst = np = 0; avgpr = avgreg = avgovt = avggp = avgfedt = avgstt = avgsst = avgdef = avgnp = 0; do { InputEmployeeData(count,r.firstname,r.lastname,&r.payrate,&r.defr,&r.hours);//Call 3.3 InputEmployeeData if (r.hours > 40)//Check for Overtime Hours { reghours = 40; ovthours = r.hours - 40; } else { reghours = r.hours; ovthours = 0; } r.gross = CalculateGross(r.hours,r.payrate,reghours,ovthours); //3.4 CalculateGross CalculateTaxes(r.gross,r.defr,&ft,&st,&ssit);//Call 3.5 CalculateTaxes r.net = r.gross - ft - st - ssit;// Calculate Net Earnings printf(REPORTCOLUMNHEADINGS1); printf(REPORTCOLUMNHEADINGS2); printf(BARS); printf(REPORTCOLUMN1,r.lastname,r.firstname,r.payrate,reghours,r.gross,ft,ssit,r.net); printf(REPORTCOLUMN2,ovthours,st,r.defr); ReportFile = fopen("report.txt", "a"); fprintf(ReportFile,REPORTCOLUMN1,r.lastname,r.firstname,r.payrate,reghours,r.gross,ft,ssit,r.net); fprintf(ReportFile,REPORTCOLUMN2,ovthours,st,r.defr); fclose(ReportFile); AddDetailToAccumulator(count,&empCount,&pr,&r.payrate,&reg,&reghours,&ovt,&ovthours,&gp,&r.gross,&fedt,&ft,&stt,&st,&sst,&ssit, &def,&r.defr,&np,&r.net,&avgpr);//3.6 while (getchar() != '\n'); printf(" Repeat (Y/N)? : "); scanf("%c",ADDR(answer)); } while (answer == 'Y' || answer == 'y'); printf("\n"); // print one line for spacing printf("\nTotals %17.2f%8.2f%10.2f%8.2f%8.2f%9.2f\n",pr,reg,gp,fedt,sst,np); printf("%32.2f%18.2f%8.2f\n",ovt,stt,def); printf("%d",count); printf("\nAverages %15.2f%8.2f%10.2f%8.2f%8.2f%9.2f\n",avgpr,avgreg,avggp,avgfedt,avgstt,avgnp); printf("%32.2f%18.2f%8.2f\n",avgovt,avgsst,avgdef); PrintSummaryReport(pr,reg,ovt,gp,fedt,stt,sst,def,np,&avgpr,avgreg,avgovt, avggp,avgfedt,avgstt,avgsst,avgdef,avgnp,ReportFile); //Call 3.7 PrintSummaryReport fflush(stdin); getchar(); return 0; } void PrintReportHeadings(FILE * ReportFile) //3.1 { ReportFile = fopen("report.txt", "w"); fprintf(ReportFile,REPORTCOLUMNHEADINGS1); fprintf(ReportFile,REPORTCOLUMNHEADINGS2); fprintf(ReportFile,BARS); fclose(ReportFile); } void InputEmployeeData(int count,char * lastname,char * firstname, float * payrate, float * defr, float * hours) //3.3 { printf("Enter employee's name: "); // input section scanf("%s%s",firstname,lastname); printf("Enter hourly pay rate: "); scanf("%f",payrate); printf("Enter deferred amount: "); scanf("%f",defr); printf("Enter hours worked this pay period: "); scanf("%f",hours); } float CalculateGross(float hours, float payrate, float reghours, float ovthours) // 3.4 { return (reghours * payrate)+(ovthours * payrate * 1.5); } void AddDetailToAccumulator(int *empCount,float *pr,float *payrate,float *reg,float *reghours,float *ovt,float *ovthours,float *gp, float *gross,float *fedt,float *ft,float *stt,float *st,float *sst,float *ssit,float *def, float *defr,float *np,float *net,float *avgpr)//3.6 { empCount = empCount +1; *pr = *pr + *payrate; *reg = *reg + *reghours; *ovt = *ovt + *ovthours; *gp = *gp + *gross; *fedt = *fedt + *ft; *stt = *stt + *st; *sst = *sst + *ssit; *def = *def + *defr; *np = *np + *net; *avgpr = *pr / empCount; } void PrintSummaryReport(float pr,float reg,float ovt,float gp,float fedt,float stt,float sst,float def,float np,float * avgpr,float avgreg,float avgovt, float avggp,float avgfedt,float avgstt,float avgsst,float avgdef,float avgnp,FILE * ReportFile) //3.7 { ReportFile = fopen("report.txt", "a"); fprintf(ReportFile,"\nTotals %17.2f%8.2f%10.2f%8.2f%8.2f%9.2f\n",pr,reg,gp,fedt,sst,np); fprintf(ReportFile,"%32.2f%18.2f%8.2f\n",ovt,stt,def); fprintf(ReportFile,"\nAverages %15.2f%8.2f%10.2f%8.2f%8.2f%9.2f\n",&avgpr,avgreg,avggp,avgfedt,avgsst,avgnp); fprintf(ReportFile,"%32.2f%18.2f%8.2f\n",avgovt,avgstt,avgdef); fclose(ReportFile); } 

Answer 1

正如之前的回答所指出的那样，你错过了*运算符。 这称为dereference运算符。

你在做什么：

 empCount = empCount +1; // or empCount++; // Same assignment 

在这里，您正在执行指针运算 。 此赋值是将指针前进到下一个整数。

你需要做什么：

 (*empcount)++; 

取消引用指针将增加指针指向的值。 换句话说，如果指针的值具有地址0x01 ，则上面的行将访问存储器位置0x01处的整数并向其添加一个整数。 原始代码只会将指针递增到下一个整数（对于32位整数，将递增到0x05 ）。

Answer 2

你在这里错过了empcount变量的*：

empCount = empCount +1;

和这里

* avgpr = * pr / empCount;