如何在if语句之后跳回代码顶部C语言

我试图让我的程序在用户从菜单中选择一个选项后重新启动。 当用户选择1，然后输入捐赠金额时，我希望程序再次启动，并显示菜单您想做什么？而不仅仅是重新启动if语句

我是否应该在if语句中添加一个for循环来实现这一点？谢谢你的帮助

 printf("What would you like to do?\n");
    printf("      1 - Donate\n");
    printf("      2 - Invest\n");
    printf("      3 - Print balance\n");
    printf("      4 - Exit\n");
    printf("\n");

    //scans menu choice
    scanf("%d", &menu_option);

    if(menu_option==1)
    {
    printf("How much do you want to donate?\n");
    scanf("%lf", &donation);
    donations_made++;
    current_Balance = initial_Balance + donation;
    }

当用户选择1，然后输入捐赠金额时，我希望程序再次启动并显示菜单

照办

for(;;) {
  printf("      1 - Donate\n");
  printf("      2 - Invest\n");
  printf("      3 - Print balance\n");
  printf("      4 - Exit\n");
  printf("\n");

  //scans menu choice
  scanf("%d", &menu_option);

  if(menu_option==1)
  {
    printf("How much do you want to donate?\n");
    scanf("%lf", &donation);
    donations_made++;
    current_Balance = initial_Balance + donation;
    // NO BREAK
  }
  else {
    .... management of other cases
    break;
  }
}

或者如果你愿意的话

do {
  printf("      1 - Donate\n");
  printf("      2 - Invest\n");
  printf("      3 - Print balance\n");
  printf("      4 - Exit\n");
  printf("\n");

  //scans menu choice
  scanf("%d", &menu_option);

  if(menu_option==1)
  {
    printf("How much do you want to donate?\n");
    scanf("%lf", &donation);
    donations_made++;
    current_Balance = initial_Balance + donation;
  }
  // ... management of other cases
} while (menu_option==1);

但是您确定不想在案例2和案例3中重做吗？在这种情况下，当菜单_选项==1时替换；按while菜单_选项！=4.或者在第一个方案中，仅当菜单选项为4时才中断

---

我还建议您检查scanf%d的返回值，&menu\u选项；为了确保输入中给出了一个有效的整数，并且设置了菜单_选项

将所有内容放入一个for；；{并执行一次中断；在除case1之外的所有情况下退出循环，将其放入循环中。

#include <stdio.h>

int main()

{
 int menu_option;
 double donation;
 int donations_made = 0;
 int current_Balance = 0;
 int initial_Balance = 0;

 for (;;)
 {

    printf("What would you like to do?\n");
    printf("      1 - Donate\n");
    printf("      2 - Invest\n");
    printf("      3 - Print balance\n");
    printf("      4 - Exit\n");
    printf("\n");

    //scans menu choice
    scanf("%d", &menu_option);

            if (menu_option==1)
            {
                   printf("How much do you want to donate?\n");
                   scanf("%lf", &donation);
                   donations_made++;
                   current_Balance = initial_Balance + donation;
             }
        else if (menu_option == 4)
                 break;

   }
}