我需要为我的第一学期 c 作业编写一个函数。如果有人可以帮助我,我已经编写了所有作业,我只需要验证用户输入。这是老师给我的……如果这还不够,我可以发布更多信息
double get_double(void)
必须使用函数来验证每个费用和收入的输入。它会不断提示用户输入一个数值,直到满足条件。该值必须是数字并且大于或等于 0。如果任何字符输入在数字之前或之后,则输入将被视为无效。
#include <stdio.h>
#include <conio.h>
double get_expenses(double* pSchool, double* pLiving, double* pTransp, double* pOther); /* function prototype */
double get_income(double* pEmploy, double* pOther); /* function prototype */
double display_report(double School, double Living, double Transp, double OtherExp, double Employ, double OtherInc); /* function prototype */
char get_char(char* pRecalculate); /* function prototype */
void clear_buffer(void); /* function prototype */
double get_double(void); /* function prototype */
main() {
double school, living, transp, otherExp;
double employ, otherInc;
char recalculate;
int counter = 1;
while (counter > 0){
printf("Student Budget Planner\n");
printf("~~~~~~~~~~~~~~~~~~~\n");
printf("Input Set: %d\n\n", counter);
get_expenses(&school, &living, &transp, &otherExp);
get_income(&employ, &otherInc);
display_report(school, living, transp, otherExp, employ, otherInc);
clear_buffer();
get_char(&recalculate);
if (recalculate == 'Y' || recalculate == 'y'){
counter = counter + 1;
} else {
counter = 0;
}
}
return 0;
}
double get_expenses(double* pSchool, double* pLiving, double* pTransp, double* pOther) {
*pSchool = *pLiving = *pTransp = *pOther = 0;
double tuition, textbooks, supplies, rent, utilities, phone, groceries;
double entertainment, transportation, car, insurance, gas, other;
printf("School Expenses:\n");
printf("~~~~~~~~~~~~~~\n");
printf("Tuition (per semester): ");
scanf("%lf", &tuition);
printf("\nTextbooks(per semester): ");
scanf("%lf", &textbooks);
printf("\nSupplies: ");
scanf("%lf", &supplies);
*pSchool = (tuition / 4) + (textbooks / 4) + supplies;
printf("\n\nLiving Expenses:\n");
printf("~~~~~~~~~~~~~\n");
printf("Residence/Rent/Mortgage: ");
scanf("%lf", &rent);
printf("\nUtilities: ");
scanf("%lf", &utilities);
printf("\nPhone/Internet: ");
scanf("%lf", &phone);
printf("\nGroceries/Eating out: ");
scanf("%lf", &groceries);
printf("\nEntertainment: ");
scanf("%lf", &entertainment);
*pLiving = rent + utilities + phone + groceries + entertainment;
printf("\n\nTransportation: \n");
printf("~~~~~~~~~~~~~\n");
printf("Public Transportation: ");
scanf("%lf", &transportation);
printf("\nCar: ");
scanf("%lf", &car);
printf("\nAuto Insurance: ");
scanf("%lf", &insurance);
printf("\nGas/Maintenance: ");
scanf("%lf", &gas);
*pTransp = transportation + car + insurance + gas;
printf("\n\nOther: \n");
printf("~~~~~\n");
printf("Any other expenses: ");
scanf("%lf", &other);
*pOther = other;
return *pSchool, *pLiving, *pTransp, *pOther;
}
double get_income(double* pEmploy, double* pOther){
*pEmploy = *pOther = 0;
double wages, family, scholarship, other;
printf("\n\nEmployment income:\n");
printf("~~~~~~~~~~~~~~~~~\n");
printf("Expected Wages/Tips: ");
scanf("%lf", &wages);
*pEmploy = wages;
printf("\n\nOther income:\n");
printf("~~~~~~~~~~~\n");
printf("Family Support: ");
scanf("%lf", &family);
printf("\nScholarship/Bursaries (per semester): ");
scanf("%lf", &scholarship);
printf("\nOther: ");
scanf("%lf", &other);
*pOther = family + scholarship + other;
return *pEmploy, *pOther;
}
double display_report(double School, double Living, double Transp, double OtherExp, double Employ, double OtherInc) {
printf("\n\nStudent Name Budget Report\n");
printf("~~~~~~~~~~~~~~~~~~~~~~~~~~~\n");
printf("Expenses:\n");
printf("~~~~~~~~\n");
printf(" MONTHLY ANNUALY\n");
printf("School Expenses: $%.2lf $%.2lf\n", School, School * 12);
printf("Living Expenses: $%.2lf $%.2lf\n", Living, Living * 12);
printf("Transportation Expenses: $%.2lf $%.2lf\n", Transp, Transp * 12);
printf("Other Expenses: $%.2lf $%.2lf\n", OtherExp, OtherExp * 12);
printf("total Expenses: $%.2lf $%.2lf\n", School + Living + Transp + OtherExp, School * 12 + Living * 12 + Transp * 12 + OtherExp * 12);
printf("Income:\n");
printf("~~~~~~~\n");
printf("Employment Income: $%.2lf $%.2lf\n", Employ, Employ * 12);
printf("Other Income: $%.2lf $%.2lf\n", OtherInc, OtherInc * 12);
printf("Total Income: $%.2lf $%.2lf\n", Employ + OtherInc, Employ * 12 + OtherInc * 12);
printf("Total Savings Available for your Goals: $%.2lf $%.2lf\n", (Employ + OtherInc) - (School + Living + Transp + OtherExp), (Employ * 12 + OtherInc * 12)- (School * 12 + Living * 12 + Transp * 12 + OtherExp * 12));
return 0;
}
char get_char(char* pRecalculate){
int valid_input;
valid_input = 0;
while (valid_input == 0){
printf("\nWould you like to recalculate your budget? (Y/N): ");
scanf("%c", &*pRecalculate);
*pRecalculate = toupper(*pRecalculate);
if (*pRecalculate == 'Y' || *pRecalculate == 'y' || *pRecalculate == 'N' || *pRecalculate == 'n') valid_input = 1;
else printf("Error Invalid choice\n");
printf("\n");
}
return *pRecalculate;
}
void clear_buffer(void) {
while ( getchar() != '\n' );
}
double get_double()
{
// What to put here?
}