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  1. C語言

    C語言面試中10個經典的基礎算法及代碼

    時間:2025-04-24 20:14:31 C語言 我要投稿
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    C語言面試中10個經典的基礎算法及代碼

      算法是一個程序和軟件的靈魂,作為一名優秀的程序員,只有對一些基礎的算法有著全面的掌握,才會在設計程序和編寫代碼的過程中顯得得心應手。以下是百分網小編搜索整理的關于C語言面試中10個經典的基礎算法及代碼,供參考學習,希望對大家有所幫助!想了解更多相關信息請持續關注我們應屆畢業生考試網!

    C語言面試中10個經典的基礎算法及代碼

      1、計算Fibonacci數列

      Fibonacci數列又稱斐波那契數列,又稱黃金分割數列,指的是這樣一個數列:1、1、2、3、5、8、13、21。

      C語言實現的代碼如下:

      /* Displaying Fibonacci sequence up to nth term where n is entered by user. */

      #include

      int main()

      {

      int count, n, t1=0, t2=1, display=0;

      printf("Enter number of terms: ");

      scanf("%d",&n);

      printf("Fibonacci Series: %d+%d+", t1, t2); /* Displaying first two terms */

      count=2; /* count=2 because first two terms are already displayed. */

      while (count

      {

      display=t1+t2;

      t1=t2;

      t2=display;

      ++count;

      printf("%d+",display);

      }

      return 0;

      }

      結果輸出:

      Enter number of terms: 10

      Fibonacci Series: 0+1+1+2+3+5+8+13+21+34+

      也可以使用下面的源代碼:

      /* Displaying Fibonacci series up to certain number entered by user. */

      #include

      int main()

      {

      int t1=0, t2=1, display=0, num;

      printf("Enter an integer: ");

      scanf("%d",&num);

      printf("Fibonacci Series: %d+%d+", t1, t2); /* Displaying first two terms */

      display=t1+t2;

      while(display

      {

      printf("%d+",display);

      t1=t2;

      t2=display;

      display=t1+t2;

      }

      return 0;

      }

      結果輸出:

      Enter an integer: 200

      Fibonacci Series: 0+1+1+2+3+5+8+13+21+34+55+89+144+

      2、回文檢查

      源代碼:

      /* C program to check whether a number is palindrome or not */

      #include

      int main()

      {

      int n, reverse=0, rem,temp;

      printf("Enter an integer: ");

      scanf("%d", &n);

      temp=n;

      while(temp!=0)

      {

      rem=temp%10;

      reverse=reverse*10+rem;

      temp/=10;

      }

      /* Checking if number entered by user and it's reverse number is equal. */

      if(reverse==n)

      printf("%d is a palindrome.",n);

      else

      printf("%d is not a palindrome.",n);

      return 0;

      }

      結果輸出

      Enter an integer: 12321

      12321 is a palindrome.

      3、質數檢查

      注:1既不是質數也不是合數。

      源代碼:

      /* C program to check whether a number is prime or not. */

      #include

      int main()

      {

      int n, i, flag=0;

      printf("Enter a positive integer: ");

      scanf("%d",&n);

      for(i=2;i<=n/2;++i)

      {

      if(n%i==0)

      {

      flag=1;

      break;

      }

      }

      if (flag==0)

      printf("%d is a prime number.",n);

      else

      printf("%d is not a prime number.",n);

      return 0;

      }

      結果輸出:

      Enter a positive integer: 29

      29 is a prime number.

      4、打印金字塔和三角形

      使用 * 建立三角形

      *

      * *

      * * *

      * * * *

      * * * * *

      源代碼

      #include

      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(" ");

      }

      return 0;

      }

      如下圖所示使用數字打印半金字塔。

      1

      1 2

      1 2 3

      1 2 3 4

      1 2 3 4 5

      源代碼:

      #include

      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("%d ",j);

      }

      printf(" ");

      }

      return 0;

      }

      用 * 打印半金字塔

      * * * * *

      * * * *

      * * *

      * *

      *

      源代碼:

      #include

      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(" ");

      }

      return 0;

      }

      用 * 打印金字塔

      *

      * * *

      * * * * *

      * * * * * * *

      * * * * * * * * *

      源代碼:

      #include

      int main()

      {

      int i,space,rows,k=0;

      printf("Enter the number of rows: ");

      scanf("%d",&rows);

      for(i=1;i<=rows;++i)

      {

      for(space=1;space<=rows-i;++space)

      {

      printf(" ");

      }

      while(k!=2*i-1)

      {

      printf("* ");

      ++k;

      }

      k=0;

      printf(" ");

      }

      return 0;

      }

      用 * 打印倒金字塔

      * * * * * * * * *

      * * * * * * *

      * * * * *

      * * *

      *

      源代碼:

      #include

      int main()

      {

      int rows,i,j,space;

      printf("Enter number of rows: ");

      scanf("%d",&rows);

      for(i=rows;i>=1;--i)

      {

      for(space=0;space

      printf(" ");

      for(j=i;j<=2*i-1;++j)

      printf("* ");

      for(j=0;j

      printf("* ");

      printf(" ");

      }

      return 0;

      }

      5、簡單的加減乘除計算器

      源代碼:

      /* Source code to create a simple calculator for addition, subtraction, multiplication and division using switch...case statement in C programming. */

      # include

      int main()

      {

      char o;

      float num1,num2;

      printf("Enter operator either + or - or * or divide : ");

      scanf("%c",&o);

      printf("Enter two operands: ");

      scanf("%f%f",&num1,&num2);

      switch(o) {

      case '+':

      printf("%.1f + %.1f = %.1f",num1, num2, num1+num2);

      break;

      case '-':

      printf("%.1f - %.1f = %.1f",num1, num2, num1-num2);

      break;

      case '*':

      printf("%.1f * %.1f = %.1f",num1, num2, num1*num2);

      break;

      case '/':

      printf("%.1f / %.1f = %.1f",num1, num2, num1/num2);

      break;

      default:

      /* If operator is other than +, -, * or /, error message is shown */

      printf("Error! operator is not correct");

      break;

      }

      return 0;

      }

      結果輸出:

      Enter operator either + or - or * or divide : -

      Enter two operands: 3.4

      8.4

      3.4 - 8.4 = -5.0

      6、檢查一個數能不能表示成兩個質數之和

      源代碼:

      #include

      int prime(int n);

      int main()

      {

      int n, i, flag=0;

      printf("Enter a positive integer: ");

      scanf("%d",&n);

      for(i=2; i<=n/2; ++i)

      {

      if (prime(i)!=0)

      {

      if ( prime(n-i)!=0)

      {

      printf("%d = %d + %d ", n, i, n-i);

      flag=1;

      }

      }

      }

      if (flag==0)

      printf("%d can't be expressed as sum of two prime numbers.",n);

      return 0;

      }

      int prime(int n) /* Function to check prime number */

      {

      int i, flag=1;

      for(i=2; i<=n/2; ++i)

      if(n%i==0)

      flag=0;

      return flag;

      }

      結果輸出:

      Enter a positive integer: 34

      34 = 3 + 31

      34 = 5 + 29

      34 = 11 + 23

      34 = 17 + 17

      7、用遞歸的方式顛倒字符串

      源代碼:

      /* Example to reverse a sentence entered by user without using strings. */

      #include

      void Reverse();

      int main()

      {

      printf("Enter a sentence: ");

      Reverse();

      return 0;

      }

      void Reverse()

      {

      char c;

      scanf("%c",&c);

      if( c != ' ')

      {

      Reverse();

      printf("%c",c);

      }

      }

      結果輸出:

      Enter a sentence: margorp emosewa

      awesome program

      8、實現二進制與十進制之間的相互轉換

      /* C programming source code to convert either binary to decimal or decimal to binary according to data entered by user. */

      #include

      #include

      int binary_decimal(int n);

      int decimal_binary(int n);

      int main()

      {

      int n;

      char c;

      printf("Instructions: ");

      printf("1. Enter alphabet 'd' to convert binary to decimal. ");

      printf("2. Enter alphabet 'b' to convert decimal to binary. ");

      scanf("%c",&c);

      if (c =='d' || c == 'D')

      {

      printf("Enter a binary number: ");

      scanf("%d", &n);

      printf("%d in binary = %d in decimal", n, binary_decimal(n));

      }

      if (c =='b' || c == 'B')

      {

      printf("Enter a decimal number: ");

      scanf("%d", &n);

      printf("%d in decimal = %d in binary", n, decimal_binary(n));

      }

      return 0;

      }

      int decimal_binary(int n) /* Function to convert decimal to binary.*/

      {

      int rem, i=1, binary=0;

      while (n!=0)

      {

      rem=n%2;

      n/=2;

      binary+=rem*i;

      i*=10;

      }

      return binary;

      }

      int binary_decimal(int n) /* Function to convert binary to decimal.*/

      {

      int decimal=0, i=0, rem;

      while (n!=0)

      {

      rem = n%10;

      n/=10;

      decimal += rem*pow(2,i);

      ++i;

      }

      return decimal;

      }

      結果輸出:

      9、使用多維數組實現兩個矩陣的相加

      源代碼:

      #include

      int main(){

      int r,c,a[100][100],b[100][100],sum[100][100],i,j;

      printf("Enter number of rows (between 1 and 100): ");

      scanf("%d",&r);

      printf("Enter number of columns (between 1 and 100): ");

      scanf("%d",&c);

      printf(" Enter elements of 1st matrix: ");

      /* Storing elements of first matrix entered by user. */

      for(i=0;i

      for(j=0;j

      {

      printf("Enter element a%d%d: ",i+1,j+1);

      scanf("%d",&a[i][j]);

      }

      /* Storing elements of second matrix entered by user. */

      printf("Enter elements of 2nd matrix: ");

      for(i=0;i

      for(j=0;j

      {

      printf("Enter element a%d%d: ",i+1,j+1);

      scanf("%d",&b[i][j]);

      }

      /*Adding Two matrices */

      for(i=0;i

      for(j=0;j

      sum[i][j]=a[i][j]+b[i][j];

      /* Displaying the resultant sum matrix. */

      printf(" Sum of two matrix is: ");

      for(i=0;i

      for(j=0;j

      {

      printf("%d ",sum[i][j]);

      if(j==c-1)

      printf(" ");

      }

      return 0;

      }

      結果輸出:

      10、矩陣轉置

      源代碼:

      #include

      int main()

      {

      int a[10][10], trans[10][10], r, c, i, j;

      printf("Enter rows and column of matrix: ");

      scanf("%d %d", &r, &c);

      /* Storing element of matrix entered by user in array a[][]. */

      printf(" Enter elements of matrix: ");

      for(i=0; i

      for(j=0; j

      {

      printf("Enter elements a%d%d: ",i+1,j+1);

      scanf("%d",&a[i][j]);

      }

      /* Displaying the matrix a[][] */

      printf(" Entered Matrix: ");

      for(i=0; i

      for(j=0; j

      {

      printf("%d ",a[i][j]);

      if(j==c-1)

      printf(" ");

      }

      /* Finding transpose of matrix a[][] and storing it in array trans[][]. */

      for(i=0; i

      for(j=0; j

      {

      trans[j][i]=a[i][j];

      }

      /* Displaying the transpose,i.e, Displaying array trans[][]. */

      printf(" Transpose of Matrix: ");

      for(i=0; i

      for(j=0; j

      {

      printf("%d ",trans[i][j]);

      if(j==r-1)

      printf(" ");

      }

      return 0;

      }

      結果輸出:

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