Thread: fgets after scanf, skips over fgets?

Hi every one I am wrting a little bs program just to practice c and this is a calorie counter that will get bigger but I am just starting with it to get the practice. Here is the code and I sperated the prolem code below when I get a value via scanf it skips the next fget.

Code:

#include<stdio.h>
#include<stdbool.h>
#include <string.h>
    int maxAday = 2500;
    int todaysCount = 0;
    bool stop = false;
    bool firstrun;
    main() 
        {
            int dowhat;
            char ate[100];
            int calIn = 0; 
            char yesno[10];

            printf("What would you like to do? \n");
            //printf("Add Calories use 0: \n Calculate Day 'cd'\n Calculate Month 'cm'\n");
            printf("Type 0 to get started.");            
            scanf("%d", &dowhat);        
                switch (dowhat)
                {
    
                case 0:
                    do
                    {
                        if (firstrun)
                        {
                        printf("Type what you ate if or manual to input the amount of calories you can also type help for a list of supported options.\n");                
                        }
                        fgets(ate,100,stdin);                        
                        *(&todaysCount) += returncals(ate);
        
                        if (firstrun)
                        {                        
                        printf("Okay we are at todays count of %d.\n", *         (&todaysCount));                        
                        printf("Add more? yes or no\n");
                        fgets(yesno,10,stdin);
                        }
                        firstrun = true;
                        if (strcmp("yes\n", yesno) == 0){
                        stop = false;
                        }                        
                        if (strcmp("no\n", yesno) == 0){
                        stop = true;        
                        }    
                    } while(!stop) ;
                 break;
                
            
                /*Will build onto
                case cd:
                break;
                case cm:

                break;        
                    
                case default:
                printf("I am sorry I did not understand");
                break;*/
                }
    
        }
    int returncals(char food[100])
            {
                int cal;
                if (strcmp("manual\n", food) == 0)
                    {
                        printf("How many calories are in the food?\n");
                        scanf("%d", &cal);
                    }
                    else if (strcmp("banana\n", food) == 0)
                    {
                        cal = 105;
                    }    
                    else 
                    {
                        cal = 0;
                    }
    

            return cal;
            }

Here is the problem code.

Code:

 scanf("%d", &cal);

Once I run scanf it completly skips the following fgets.

Code:

 fgets(yesno,10,stdin);

The scanf gets a calorie value and goes back main and asks if the user wants to start the loop over but the loop starts over anyway and it is skipped. here is a image.

Does anyone know why it does this?