正文

“新手必看！精选30道C语言笔试题，轻松入门编程之路”

/0 浏览量
0814

题目1：输出“Hello, World!”

#include <stdio.h>

int main() {
    printf("Hello, World!\n");
    return 0;
}

题目2：计算两个整数的和

#include <stdio.h>

int main() {
    int a, b, sum;
    printf("Enter two integers: ");
    scanf("%d %d", &a, &b);
    sum = a + b;
    printf("Sum = %d\n", sum);
    return 0;
}

题目3：判断一个整数是否为偶数

#include <stdio.h>

int main() {
    int num;
    printf("Enter an integer: ");
    scanf("%d", &num);
    if (num % 2 == 0) {
        printf("%d is even.\n", num);
    } else {
        printf("%d is odd.\n", num);
    }
    return 0;
}

题目4：计算一个数的阶乘

#include <stdio.h>

int factorial(int n) {
    if (n == 0) {
        return 1;
    } else {
        return n * factorial(n - 1);
    }
}

int main() {
    int num;
    printf("Enter an integer: ");
    scanf("%d", &num);
    printf("Factorial of %d is %d\n", num, factorial(num));
    return 0;
}

题目5：打印乘法表

#include <stdio.h>

int main() {
    int i, j;
    for (i = 1; i <= 9; i++) {
        for (j = 1; j <= i; j++) {
            printf("%d*%d=%d ", j, i, i * j);
        }
        printf("\n");
    }
    return 0;
}

题目6：计算一个字符串的长度

#include <stdio.h>
#include <string.h>

int main() {
    char str[100];
    printf("Enter a string: ");
    scanf("%99s", str);
    printf("Length of string is %ld\n", strlen(str));
    return 0;
}

题目7：将一个字符串转换为大写

#include <stdio.h>
#include <ctype.h>

void toUpperCase(char *str) {
    while (*str) {
        *str = toupper((unsigned char)*str);
        str++;
    }
}

int main() {
    char str[100];
    printf("Enter a string: ");
    scanf("%99s", str);
    toUpperCase(str);
    printf("Uppercase string: %s\n", str);
    return 0;
}

题目8：计算一个整数的平方根

#include <stdio.h>
#include <math.h>

double squareRoot(double n) {
    return sqrt(n);
}

int main() {
    double num;
    printf("Enter a number: ");
    scanf("%lf", &num);
    printf("Square root of %lf is %lf\n", num, squareRoot(num));
    return 0;
}

题目9：计算两个数的最大公约数

#include <stdio.h>

int gcd(int a, int b) {
    if (b == 0) {
        return a;
    } else {
        return gcd(b, a % b);
    }
}

int main() {
    int num1, num2;
    printf("Enter two integers: ");
    scanf("%d %d", &num1, &num2);
    printf("GCD of %d and %d is %d\n", num1, num2, gcd(num1, num2));
    return 0;
}

题目10：判断一个年份是否为闰年

#include <stdio.h>

int isLeapYear(int year) {
    if ((year % 4 == 0 && year % 100 != 0) || year % 400 == 0) {
        return 1;
    } else {
        return 0;
    }
}

int main() {
    int year;
    printf("Enter a year: ");
    scanf("%d", &year);
    if (isLeapYear(year)) {
        printf("%d is a leap year.\n", year);
    } else {
        printf("%d is not a leap year.\n", year);
    }
    return 0;
}

题目11：计算一个数的阶乘（使用循环）

#include <stdio.h>

int main() {
    int num, i, factorial = 1;
    printf("Enter an integer: ");
    scanf("%d", &num);
    for (i = 1; i <= num; i++) {
        factorial *= i;
    }
    printf("Factorial of %d is %d\n", num, factorial);
    return 0;
}

题目12：打印一个倒三角形的图案

#include <stdio.h>

int main() {
    int i, j, rows;
    printf("Enter the number of rows: ");
    scanf("%d", &rows);
    for (i = rows; i >= 1; i--) {
        for (j = 1; j <= i; j++) {
            printf("*");
        }
        printf("\n");
    }
    return 0;
}

题目13：计算一个数的幂

#include <stdio.h>

double power(double base, int exp) {
    double result = 1.0;
    for (int i = 0; i < exp; i++) {
        result *= base;
    }
    return result;
}

int main() {
    double base;
    int exp;
    printf("Enter base and exponent: ");
    scanf("%lf %d", &base, &exp);
    printf("%lf to the power of %d is %lf\n", base, exp, power(base, exp));
    return 0;
}

题目14：判断一个数是否为素数

#include <stdio.h>
#include <stdbool.h>

bool isPrime(int n) {
    if (n <= 1) {
        return false;
    }
    for (int i = 2; i * i <= n; i++) {
        if (n % i == 0) {
            return false;
        }
    }
    return true;
}

int main() {
    int num;
    printf("Enter an integer: ");
    scanf("%d", &num);
    if (isPrime(num)) {
        printf("%d is a prime number.\n", num);
    } else {
        printf("%d is not a prime number.\n", num);
    }
    return 0;
}

题目15：计算一个字符串中字符的数量

#include <stdio.h>
#include <string.h>

int countChars(char *str) {
    int count = 0;
    while (*str) {
        count++;
        str++;
    }
    return count;
}

int main() {
    char str[100];
    printf("Enter a string: ");
    scanf("%99s", str);
    printf("Number of characters in string: %d\n", countChars(str));
    return 0;
}

题目16：将一个字符串转换成小写

#include <stdio.h>
#include <ctype.h>

void toLowerCase(char *str) {
    while (*str) {
        *str = tolower((unsigned char)*str);
        str++;
    }
}

int main() {
    char str[100];
    printf("Enter a string: ");
    scanf("%99s", str);
    toLowerCase(str);
    printf("Lowercase string: %s\n", str);
    return 0;
}

题目17：计算一个整数的立方根

#include <stdio.h>
#include <math.h>

double cubeRoot(double n) {
    return cbrt(n);
}

int main() {
    double num;
    printf("Enter a number: ");
    scanf("%lf", &num);
    printf("Cube root of %lf is %lf\n", num, cubeRoot(num));
    return 0;
}

题目18：计算两个数的最大公约数（使用辗转相除法）

#include <stdio.h>

int gcd(int a, int b) {
    while (b != 0) {
        int temp = b;
        b = a % b;
        a = temp;
    }
    return a;
}

int main() {
    int num1, num2;
    printf("Enter two integers: ");
    scanf("%d %d", &num1, &num2);
    printf("GCD of %d and %d is %d\n", num1, num2, gcd(num1, num2));
    return 0;
}

题目19：判断一个年份是否为闰年（使用位运算）

#include <stdio.h>

int isLeapYear(int year) {
    return (year & 3) == 0 && (year % 100 != 0 || (year % 400) == 0);
}

int main() {
    int year;
    printf("Enter a year: ");
    scanf("%d", &year);
    if (isLeapYear(year)) {
        printf("%d is a leap year.\n", year);
    } else {
        printf("%d is not a leap year.\n", year);
    }
    return 0;
}

题目20：计算一个整数的平方

#include <stdio.h>

int square(int n) {
    return n * n;
}

int main() {
    int num;
    printf("Enter an integer: ");
    scanf("%d", &num);
    printf("Square of %d is %d\n", num, square(num));
    return 0;
}

题目21：打印一个直角三角形的图案

#include <stdio.h>

int main() {
    int i, j, rows;
    printf("Enter the number of rows: ");
    scanf("%d", &rows);
    for (i = 1; i <= rows; i++) {
        for (j = 1; j <= i; j++) {
            printf("*");
        }
        printf("\n");
    }
    return 0;
}

题目22：计算一个整数的十进制表示中数字的数量

#include <stdio.h>

int countDigits(int n) {
    int count = 0;
    while (n != 0) {
        count++;
        n /= 10;
    }
    return count;
}

int main() {
    int num;
    printf("Enter an integer: ");
    scanf("%d", &num);
    printf("Number of digits in %d is %d\n", num, countDigits(num));
    return 0;
}

题目23：计算一个整数的阶乘（使用递归）

#include <stdio.h>

int factorial(int n) {
    if (n == 0) {
        return 1;
    } else {
        return n * factorial(n - 1);
    }
}

int main() {
    int num;
    printf("Enter an integer: ");
    scanf("%d", &num);
    printf("Factorial of %d is %d\n", num, factorial(num));
    return 0;
}

题目24：判断一个数是否为偶数（使用位运算）

#include <stdio.h>

int isEven(int n) {
    return (n & 1) == 0;
}

int main() {
    int num;
    printf("Enter an integer: ");
    scanf("%d", &num);
    if (isEven(num)) {
        printf("%d is even.\n", num);
    } else {
        printf("%d is odd.\n", num);
    }
    return 0;
}

题目25：计算一个整数的立方

#include <stdio.h>

int cube(int n) {
    return n * n * n;
}

int main() {
    int num;
    printf("Enter an integer: ");
    scanf("%d", &num);
    printf("Cube of %d is %d\n", num, cube(num));
    return 0;
}

题目26：判断一个数是否为素数（使用试除法）

#include <stdio.h>
#include <stdbool.h>

bool isPrime(int n) {
    if (n <= 1) {
        return false;
    }
    for (int i = 2; i * i <= n; i++) {
        if (n % i == 0) {
            return false;
        }
    }
    return true;
}

int main() {
    int num;
    printf("Enter an integer: ");
    scanf("%d", &num);
    if (isPrime(num)) {
        printf("%d is a prime number.\n", num);
    } else {
        printf("%d is not a prime number.\n", num);
    }
    return 0;
}

题目27：计算一个整数的平方根（使用牛顿迭代法）

#include <stdio.h>
#include <math.h>

double squareRoot(double n) {
    double guess = n / 2.0;
    double error = 1e-10;
    while (fabs(guess * guess - n) > error) {
        guess = (guess + n / guess) / 2.0;
    }
    return guess;
}

int main() {
    double num;
    printf("Enter a number: ");
    scanf("%lf", &num);
    printf("Square root of %lf is %lf\n", num, squareRoot(num));
    return 0;
}

题目28：判断一个数是否为偶数（使用位运算）

#include <stdio.h>

int isEven(int n) {
    return (n & 1) == 0;
}

int main() {
    int num;
    printf("Enter an integer: ");
    scanf("%d", &num);
    if (isEven(num)) {
        printf("%d is even.\n", num);
    } else {
        printf("%d is odd.\n", num);
    }
    return 0;
}

题目29：计算一个整数的立方根（使用牛顿迭代法）

#include <stdio.h>
#include <math.h>

double cubeRoot(double n) {
    double guess = n / 3.0;
    double error = 1e-10;
    while (fabs(guess * guess * guess - n) > error) {
        guess = (2.0 * guess + n / (guess * guess)) / 3.0;
    }
    return guess;
}

int main() {
    double num;
    printf("Enter a number: ");
    scanf("%lf", &num);
    printf("Cube root of %lf is %lf\n", num, cubeRoot(num));
    return 0;
}

题目30：判断一个数是否为素数（使用试除法）

#include <stdio.h>
#include <stdbool.h>

bool isPrime(int n) {
    if (n <= 1) {
        return false;
    }
    for (int i = 2; i * i <= n; i++) {
        if (n % i == 0) {
            return false;
        }
    }
    return true;
}

int main() {
    int num;
    printf("Enter an integer: ");
    scanf("%d", &num);
    if (isPrime(num)) {
        printf("%d is a prime number.\n", num);
    } else {
        printf("%d is not a prime number.\n", num);
    }
    return 0;
}
-- 展开阅读全文 --