Having difficulty correctly inputting multiple integers at the same time using scanf()

Question

So I have a coding project where I have to calculate the overall grade of a student in a class where they have 4 quizzes, 2 midterms, and 1 final exam. The quiz and exam are weighted 30% and the midterm 40%. I just help with 2 things:

1. My code doesn't want to start w/o having 4 individual input numbers (79 80 0 0).
2. When getting to the exam part of the code, it for some reason bypasses the needed user input and autos it to the 3rd number in the quiz coding. I'm coding in c programming.

#include <stdio.h>

int main()
{
    int testOne, testTwo;
    float totTest, percTest, testPoint;
    printf("Enter you test grades:\n");
    scanf("%d%d\n",&testOne,&testTwo);
    totTest=testOne+testTwo;
    printf("Your total grade points is: %.1f\n", totTest);
    testPoint=200;
    percTest=(totTest*.40)/testPoint *100;
    printf("Your percentage is %.1f%\n", percTest);
    
    int quizOne, quizTwo, quizThree, quizFour;
    float totQuiz, percQuiz, quizPoint;
    printf("Enter you quiz grades:\n");
    scanf("%d%d%d%d\n", &quizOne, &quizTwo, &quizThree, &quizFour);
    totQuiz=quizOne+quizTwo+quizThree+quizFour;
    printf("Your total quiz grade is %.1f\n", totQuiz);
    quizPoint=400;
    percQuiz=(totQuiz*.30)/quizPoint *100;
    printf("Your quiz percentage is %.1f%\n", percQuiz);
    
    int examOne, examPoint; <This is the code that automatically messes up>
    float percExam, finGrade;
    printf("Enter your exam grade\n");
    scanf(" %d\n", &examOne);
    examPoint=100;
    percExam=(examOne*.30)/examPoint *100;
    printf("Your final exam grade is %.1f\n", percExam);
    finGrade=(percExam+percQuiz+percTest);
    printf("Your overall grade is %.1f%\n", finGrade);
    
    return 0;
}

Answer 1

Your problems have nothing to do with the logic of your program, nothing to do with computing grades, and everything to do with: scanf. scanf is simultaneously the most useful-looking, and the most actually useless, function in the C library when it comes to introductory C programming.

Here are three simple rules for using scanf in introductory C programming:

1. Use only one of the following four input formats: "%d", "%s", "%f", "%lf". If you simply must read individual characters, you can add a fifth: " %c" (but make sure you always use that extra space). Use these in isolation, one at a time, without combining them or adding any other characters.

2. Always check the return value of scanf. If it does not return 1, print an error message and exit: if(scanf(...) != 1) {printf("input error!\n"); exit(1); }

3. If you want to do something fancier, that you can't accomplish with the limited number of formats allowed by rule 1, then it's time to learn how to use something better than scanf.

In particular, don't try to read multiple numbers at once using formats like %d%d. And don't use \n in scanf format statements, either — it doesn't do what you think, and it's probably causing you problems.