How can I make a program not output anything when ctrl +d is

I have a C program and when I press ctrl +d right after the program starts, it ends in an infinite loop. Should I press ctrl +d in the course of the program it still gives me an output.

Is there a way to make the program exit without any output when CTRL +D is pressed

This is my code:

         ...
    
       {
            int repeats = 0, counter = 0;
            //Amount of triangles
            repeats = checkInput0();
            int i;
            
            
            // scanf("%d", &repeats);  //num is the user input
            for(i=0; i<repeats; i++)
            {
                //printf("enter first number");
                a_arr[i] = checkInput1();
                //printf("enter first number");
                b_arr[i] = checkInput2();
                //printf("enter first number");
                c_arr[i] = checkInput3();
            }
            
            
            float a_sqrd;
            float b_sqrd;
            float c_sqrd;
            
            
            //     checking if given triangle is valid
            do {
                a = a_arr[counter];
                b = b_arr[counter];
                c = c_arr[counter];
                a_sqrd = a*a;
                b_sqrd = b*b;
                c_sqrd = c*c;
                
                if((a + b > c) && (a + c > b) && (b + c > a))
                {
                    // Checking for special cases of triangle
                    
                    if(a==b && b==c)
                    {
                        /* If all sides are equal */
                        printf("Triplet %d (a = %f b = %f c = %f) is a triangle. \n It is an Equilateral triangle \n", counter+1 , a , b ,c );
                    }
                    else if(a==b || a==c || b==c)
                    {
                        /* If any two sides are equal */
                        printf("Triplet %d (a = %f b = %f c = %f) is a triangle. \n It is an Isosceles triangle \n", counter+1 , a , b , c );
                    }
                    else if ((a_sqrd + b_sqrd) == c_sqrd || (b_sqrd + c_sqrd) == a_sqrd || (a_sqrd + c_sqrd == b_sqrd))
                    {
                        printf("Triplet %d (a = %f b = %f c = %f) is a triangle. \n It is a right angle triangle \n", counter+1 , a , b, c );
                    }
                else
                    printf("Triplet %d (a = %f b = %f c = %f) is a triangle.\n", counter+1 , a , b, c );
                }
                else
                {
                    printf("Triplet %d (a = %f b = %f c = %f) is NO Triangle. \n", counter+1 , a , b , c );
                }
                
                
                counter++;
            }while(counter < repeats);
            
            
            
            return 0;
        }
        
        // Validation
        // Validate the number of triangles
        
        
        int checkInput0(void){
            int option0,check0;
            char c;
            
            do{
                printf("Enter the amount of triangles you want to check: \n");
                
                if(scanf("%d%c",&option0,&c) == 0 || c != '\n' || option0 == 0 ){
                    while((check0 = getchar()) != 0 && check0 != '\n' && check0 != EOF);
                    printf("[ERR] Invalid number of triangles.\n");
                }else{
                    break;
                }
            }while(1);
            return option0;
        }
        
        // Validate Value of a
        
        float checkInput1(void){
            float option1,check1;
            char c;
            
            do{
                printf("Enter the first side of the triangle: ");
                
                if(scanf("%f%c",&option1,&c) == 0 || c != '\n'){
                    while((check1 = getchar()) != 0 && check1 != '\n' && check1 != EOF);
                    printf("\t[ERR] Invalid number for the triplet.\n");
                }else{
                    break;
                }
            }while(1);
            return option1;
        }
        
        // Validate Value of b
        float checkInput2(void){
            float option2,check2;
            char c;
            do{
                printf("Enter the second side of the triangle: ");
                
                if(scanf("%f%c",&option2,&c) == 0 || c != '\n'){
                    while((check2 = getchar()) != 0 && check2 != '\n' && check2 != EOF);
                    printf("\t[ERR] Invalid number for the triplet.\n");
                }else{
                    break;
                }
            }while(1);
            return option2;
        }
        // Validate Value of c
        float checkInput3(void){
            float option3,check3;
            char c;
            
            do{
                printf("Enter the third side of the triangle: ");
                
                if(scanf("%f%c",&option3,&c) == 0 || c != '\n'){
                    while((check3 = getchar()) != 0 && check3 != '\n' && check3 != EOF);
                    printf("\t[ERR] Invalid number for the triplet.\n");
                }else{
                    break;
                }
            }while(1);
            return option3;
        }

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Output:

    Enter the amount of triangles you want to check:
if I press ctrl + d immediately after this appears I get an endless loop of:

    Enter the amount of triangles you want to check:
    [ERR] Invalid number of triangles.

But if I add a value for

    Enter the amount of triangles you want to check:
like 2
then I get this output after prssing ctrl + d

    Enter the first side of the triangle: Enter the second side of the triangle: Enter the third side of the triangle: Enter the first side of the triangle: Enter the second side of the triangle: Enter the third side of the triangle: Triplet 1 (a = 0.000000 b = 0.000000 c = 0.000000) is a triangle.
     It is an Equilateral triangle
    Triplet 2 (a = 0.000000 b = 0.000000 c = 0.000000) is a triangle.
     It is an Equilateral triangle
    Program ended with exit code: 0

But I would like the program to end without an output when ctrl + d is pressed.

Thanks in advance.