C Program can help me? : Hello i am start programing c ut i dont know why my program is make bad outputs.

    #include <stdio.h>
    void main(void)
    {
      char res,res1;
     float money=10;

     printf("***Wealcome to Peace of Mind***");
     printf("\nHello we have the menu please check::");
     printf("\n***Menú***");
     printf("\n");
     printf("\n<<<Bebidas>>>");
     printf("\n 1 - Coca-Cola = 1,5     2 - IceTea = 1,4");
     printf("\n 3 - Super Bock = 1,70    4 - Sumol = 1,6");
     printf("\n");
     scanf("%d",&res);
     switch(res)
     {
        case 1 || 'Coca-Cola':money - CocaCola;break;

     }
     printf("%.1f",money);
        
     //Is that result i want: 
        printf("\n%.1f",10-1.5);
    }

OutPut: [1]: http://prntscr.com/lkg1rd