Switch 中的 C 帮助

Question

如果我想让案例返回到上一个菜单，我应该在案例中添加什么语句？例如:

int main()
{
int nNum;
int nNum2;
int nNum3, nInTime, nOutTime, nTimeDiff, nNum4, nNum5 nOvertimeHours;
float fBaseSalary;
printf("1-Regular Weekly Salary Computation \n2-Cutomized Salary Computation \n3 -Exit \n\nEnter number: ");
scanf("%d",&nNum);

switch(nNum)
{
    case 1:
        printf("\nYou have selected Regular Salary Computation!\nDetails:\nDaily Rate:500\nDay Type:Normal\nIn Time:900\nOut Time:900\nNumber of Work Days:5\nWeekly Salary:2500");
        break;
    case 2:
        printf("\nYou have selected Cutomized Salary Computation!\n\nPlease enter number to choose corresponding details:");
        printf("\n\nType of Day:\n1-Overtime \n2-Regular Work hours\n\nPlease select number: ");
        scanf("%d", &nNum2);
        printf("IN time:");
        scanf("%d", &nInTime);
        printf("OUT time:");
        scanf("%d", &nOutTime);
        printf("Base Salary:");
        scanf("%f", &fBaseSalary);
        nTimeDiff = nOutTime - nInTime;
        switch(nNum2)
        {
            case 1:
                if(nTimeDiff > 800)
                {   printf("\n1-Non-night shift overtime\n2-Night shift overtime\nPlease select number:");
                    scanf("%d",&nNum3);
                    switch(nNum3)
                        {
                            case 1:
                                printf("1-Normal Day\n2-Rest Day\n3-Special Non-Working Day\n4-Special Non-Working Day and Rest Day\n5-Regular Holiday\n6-Regular Holiday and Rest Day\nSelect Number:");
                                scanf("%d", &nNum4);
                                switch(nNum4)
                                {
                                    case 1:
                                        printf("Base Salary                         | %f\n", fBaseSalary);
                                        nOvertimeHours = (nTimeDiff - 800 ) / 100;
                                        printf("Overtime Hours(Night Shift OT Hours)| %d(0)\n", nOvertimeHours);
                                        printf("IN Time                  | %d\n", nInTime);
                                        printf("OUT Time                 | %d\n", nOutTime);
                                        printf("Day Type                            |Normal Day with Overtime\n");
                                        printf("Salary of the Day                   |%f", getNormalDayNonNightShiftOT(fBaseSalary, nOutTime, nInTime));
                                        break;
                                    case 2:
                                        printf("Base Salary                         | %f\n", fBaseSalary);
                                        nOvertimeHours = (nTimeDiff - 800 ) / 100;
                                        printf("Overtime Hours(Night Shift OT Hours)| %d(0)\n", nOvertimeHours);
                                        printf("IN Time                  | %d\n", nInTime);
                                        printf("OUT Time                 | %d\n", nOutTime);
                                        printf("Day Type                            |Rest Day with Overtime\n");
                                        printf("Salary of the Day                   |%f", getRestDayNonNightShiftOT(fBaseSalary, nOutTime, nInTime));
                                        break;
                                    case 3:
                                        printf("Base Salary                         | %f\n", fBaseSalary);
                                        nOvertimeHours = (nTimeDiff - 800 ) / 100;
                                        printf("Overtime Hours(Night Shift OT Hours)| %d(0)\n", nOvertimeHours);
                                        printf("IN Time                  | %d\n", nInTime);
                                        printf("OUT Time                 | %d\n", nOutTime);
                                        printf("Day Type                            |Special Non-Working Holiday with Overtime\n");
                                        printf("Salary of the Day                   |%f", getSpecialNonWorkingDayNonNightShiftOT(fBaseSalary, nOutTime, nInTime));
                                        break;
                                    case 4:
                                        printf("Base Salary                         | %f\n", fBaseSalary);
                                        nOvertimeHours = (nTimeDiff - 800 ) / 100;
                                        printf("Overtime Hours(Night Shift OT Hours)| %d(0)\n", nOvertimeHours);
                                        printf("IN Time                  | %d\n", nInTime);
                                        printf("OUT Time                 | %d\n", nOutTime);
                                        printf("Day Type                            |Special Non-Working and Rest Day with Overtime\n");
                                        printf("Salary of the Day                   |%f", getSpecialNonWorkingAndRestDayNonNightShiftOT(fBaseSalary, nOutTime, nInTime));
                                        break;
                                    case 5:
                                        printf("Base Salary                         | %f\n", fBaseSalary);
                                        nOvertimeHours = (nTimeDiff - 800 ) / 100;
                                        printf("Overtime Hours(Night Shift OT Hours)| %d(0)\n", nOvertimeHours);
                                        printf("IN Time                  | %d\n", nInTime);
                                        printf("OUT Time                 | %d\n", nOutTime);
                                        printf("Day Type                            |Regular Holiday with Overtime\n");
                                        printf("Salary of the Day                   |%f", getRegularHoliDayNonNightShiftOT(fBaseSalary, nOutTime, nInTime));
                                        break;
                                    case 6:
                                        printf("Base Salary                         | %f\n", fBaseSalary);
                                        nOvertimeHours = (nTimeDiff - 800 ) / 100;
                                        printf("Overtime Hours(Night Shift OT Hours)| %d(0)\n", nOvertimeHours);
                                        printf("IN Time                  | %d\n", nInTime);
                                        printf("OUT Time                 | %d\n", nOutTime);
                                        printf("Day Type                            |Regular Holiday and Rest Day with Overtime\n");
                                        printf("Salary of the Day                   |%f",  getRegularHolidayAndRestDayNonNightShiftOT(fBaseSalary, nOutTime, nInTime)); 
                                        break;
                                }
                        }
                }
                else if(nTimeDiff <= 800)
                    {
                    printf("Work hours did not exceed 8 hours. Overtime computation invalid.");
                    return 0;
                    }       
        }   case 2:
                if(nInTime => 2200 || nIntime <=0600 || nOutTime => 2200 || nOutTime <= 600)
                printf("1-Normal Day\n2-Rest Day\n3-Special Non-Working Day\n4-Special Non-Working Day and Rest Day\n5-Regular Holiday\n6-Regular Holiday and Rest Day\nSelect Number:");
                scanf("%d", &nNum5);
                switch(nNum5)
                    case 1:
   }
return 0;
}

我仍在研究它，但我打算在每个 switch 中添加一个额外的 case，这将使用户能够返回到上一个 switch 语句。例如，如果用户一开始按了错误的按钮并选择了错误的选项，则按 3 将使用户返回到上一个菜单

Answer 1

您可以使用 goto 语句。

switch(num1)
switchnum1:
    case 1:
        printf("Haha");
    case 2:
        switch(num2)
             case 1:
                 printf("hoho");
             case 2:
             //go back to the previous switch
             goto switchnum1;

但是，这将导致无限循环，除非在 goto 路径中，num1 被修改。如果你想要 num1 == num2，那么所有案例会有 如果(数字 1 == 数字 2) 转到 switchnum1；goto 可以根据您要编程的内容来解决它，但是不建议将 goto 作为良好的编程实践。