📌 The computer science entrance exam in Shanxi has a high score of 150 points, which is a key subject for passing the exam.Many students memorize a lot of knowledge points, but when they encounter code completion / program correction / algorithm implementation in the exam, they easily panic.In fact, the exam often revolves around several classic snippets.Today, I have compiled the 5 essential C code snippets that you can use👇🔹 Snippet 1: Input and Output (Must Know)

#include <stdio.h>
int main() {
    int a, b;
    scanf("%d %d", &a, &b);   // Input two integers
    printf("%d\n", a + b);    // Output the sum
    return 0;
}

👉 Common Exam Types:Input and output formats, variable types, format specifiers %d / %f / %c.🔹 Snippet 2: Sum Calculation Using Loop (for loop)

#include <stdio.h>
int main() {
    int i, sum = 0;
    for(i = 1; i <= 100; i++) {
        sum += i;
    }
    printf("%d\n", sum);
    return 0;
}

👉 Common Exam Types:for loop initialization / condition / increment, testing loop syntax and variable control.🔹 Snippet 3: Prime Number Check (if + loop)

#include <stdio.h>
#include <math.h>
int main() {
    int n, i, flag = 1;
    scanf("%d", &n);
    for(i = 2; i <= sqrt(n); i++) {
        if(n % i == 0) {
            flag = 0; break;
        }
    }
    if(flag) printf("Prime\n");
    else printf("Not Prime\n");
    return 0;
}

👉 Common Exam Types:Nested loops, break statements, modulus operations.🔹 Snippet 4: Finding Maximum in an Array

#include <stdio.h>
int main() {
    int a[5] = {3, 7, 2, 9, 5};
    int i, max = a[0];
    for(i = 1; i < 5; i++) {
        if(a[i] > max) max = a[i];
    }
    printf("Max=%d\n", max);
    return 0;
}

👉 Common Exam Types:Array traversal, comparison operations, loop logic.🔹 Snippet 5: String Operations (Common Pitfalls)

#include <stdio.h>
#include <string.h>
int main() {
    char str[20];
    gets(str);    // Input string
    printf("%d\n", strlen(str));  // Output length
    return 0;
}

👉 Common Exam Types:String functions strlen / strcpy / strcmp, input-output formats and array differences.

✅ Summary from Senior

In C language exams, it’s not just about memorization, but about memorizing + coding + summarizing.

These 5 classic snippets are often tested in various forms every year.

Remember them, and you will be ahead of many classmates!

✨ I am Senior Xiaolin, focusing on planning and tutoring for computer science entrance exams in Shanxi.👉 Follow me for more real exam analysis, review planning, and high-frequency coding points, to help you avoid detours and succeed!