C语言是一门通用计算机编程语言,应用广泛。下面是小编整理的C语言基础知识大全,希望对大家有帮助!

  1、C语言打印一条语句源代码:

  /* C Program to print a sentence. */

  #include

  int main()

  {

  printf("C Programming"); /* printf() prints the content inside quotation */

  return 0;

  }

  输出:

  C Programming

  2、C语言打印用户输入的一个整数#include

  int main()

  {

  int num;

  printf("Enter a integer: ");

  scanf("%d",&num); /* Storing a integer entered by user in variable num */

  printf("You entered: %d",num);

  return 0;

  }

  输出:

  Enter a integer: 25You entered: 25

  3、C语言实现两个整数相加

  /*C programming source code to add and display the sum of two integers entered by user */

  #include

  int main( )

  {

  int num1, num2, sum;

  printf("Enter two integers: ");

  scanf("%d %d",&num1,&num2); /* Stores the two integer entered by user in variable num1 and num2 */

  sum=num1+num2; /* Performs addition and stores it in variable sum */

  printf("Sum: %d",sum); /* Displays sum */

  return 0;

  }

  输出:

  Enter two integers: 1211Sum: 23

  4、C语言实现两个小数相乘/

  *C program to multiply and display the product of two floating point numbers entered by user. */

  #include

  int main( )

  {

  float num1, num2, product;

  printf("Enter two numbers: ");

  scanf("%f %f",&num1,&num2); /* Stores the two floating point numbers entered by user in variable num1 and num2 respectively */

  product = num1*num2; /* Performs multiplication and stores it */

  printf("Product: %f",product);

  return 0;

  }

  输出:

  Enter two numbers: 2.41.1Product: 2.640000

  5、C语言查找字符的ASCII值/

  * Source code to find ASCII value of a character entered by user */

  #include

  int main(){

  char c;

  printf("Enter a character: ");

  scanf("%c",&c); /* Takes a character from user */

  printf("ASCII value of %c = %d",c,c);

  return 0;

  }

  输出:

  Enter a character: GASCII value of G = 71

  6、C语言根据用户输入的整数做商和余数

  /* C Program to compute remainder and quotient */

  #include

  int main(){

  int dividend, divisor, quotient, remainder;

  printf("Enter dividend: ");

  scanf("%d",÷nd);

  printf("Enter divisor: ");

  scanf("%d",&divisor);

  quotient=dividend/divisor; /* Computes quotient */

  remainder=dividend%divisor; /* Computes remainder */

  printf("Quotient = %d",quotient);

  printf("Remainder = %d",remainder);

  return 0;

  }

  输出:

  Enter dividend: 25Enter divisor: 4Quotient = 6Remainder = 1

  7、C语言获取整型、单精度浮点型、双精度浮点型和字符型的长度基本语法:

  /* This program computes the size of variable using sizeof operator.*/

  #include

  int main(){

  int a;

  float b;

  double c;

  char d;

  printf("Size of int: %d bytes",sizeof(a));

  printf("Size of float: %d bytes",sizeof(b));

  printf("Size of double: %d bytes",sizeof(c));

  printf("Size of char: %d byte",sizeof(d));

  return 0;

  }

  输出:

  Size of int: 4 bytesSize of float: 4 bytesSize of double: 8 bytesSize of char: 1 byte

  8、C语言获取关键字long的长度范围

  #include

  int main(){

  int a;

  long int b; /* int is optional. */

  long long int c; /* int is optional. */

  printf("Size of int = %d bytes",sizeof(a));

  printf("Size of long int = %ld bytes",sizeof(b));

  printf("Size of long long int = %ld bytes",sizeof(c));

  return 0;

  }

  输出:

  Size of int = 4 bytesSize of long int = 4 bytesSize of long long int = 8 bytes

  9、C语言交换数值

  #include

  int main(){

  float a, b, temp;

  printf("Enter value of a: ");

  scanf("%f",&a);

  printf("Enter value of b: ");

  scanf("%f",&b);

  temp = a; /* Value of a is stored in variable temp */

  a = b; /* Value of b is stored in variable a */

  b = temp; /* Value of temp(which contains initial value of a) is stored in variable b*/

  printf("After swapping, value of a = %.2f", a);

  printf("After swapping, value of b = %.2f", b);

  return 0;

  }

  输出:

  Enter value of a: 1.20Enter value of b: 2.45After swapping, value of a = 2.45After swapping, value of b = 1.2

  10、C语言检查数值是奇数还是偶数

  /*C program to check whether a number entered by user is even or odd. */

  #include

  int main(){

  int num;

  printf("Enter an integer you want to check: ");

  scanf("%d",&num);

  if((num%2)==0) /* Checking whether remainder is 0 or not. */

  printf("%d is even.",num);

  else

  printf("%d is odd.",num);

  return 0;

  }

  输出1:

  Enter an integer you want to check: 2525 is odd.

  输出2:

  Enter an integer you want to check: 1212 is even.

  也可以用条件运算符解决:

  /* C program to check whether an integer is odd or even using conditional operator */

  #include

  int main(){

  int num;

  printf("Enter an integer you want to check: ");

  scanf("%d",&num);

  ((num%2)==0) ? printf("%d is even.",num) : printf("%d is odd.",num);

  return 0;

  }

  11、C语言检查是元音还是辅音

  #include

  int main(){

  char c;

  printf("Enter an alphabet: ");

  scanf("%c",&c);

  if(c=='a'||c=='A'||c=='e'||c=='E'||c=='i'||c=='I'||c=='o'||c=='O'||c=='u'||c=='U')

  printf("%c is a vowel.",c);

  else

  printf("%c is a consonant.",c);

  return 0;

  }

  输出1:

  Enter an alphabet: ii is a vowel.

  输出2:

  Enter an alphabet: GG is a consonant.

  也可以用条件运算符解决

  /* C program to check whether a character is vowel or consonant using conditional operator */

  #include

  int main(){

  char c;

  printf("Enter an alphabet: ");

  scanf("%c",&c);

  (c=='a'||c=='A'||c=='e'||c=='E'||c=='i'||c=='I'||c=='o'||c=='O'||c=='u'||c=='U') ? printf("%c is a vowel.",c) : printf("%c is a consonant.",c);

  return 0;

  }

  输出结果和上面的程序相同。

  12、C语言实现从三个数值中查找最大值实现1:

  /* C program to find largest number using if statement only */

  #include

  int main(){

  float a, b, c;

  printf("Enter three numbers: ");

  scanf("%f %f %f", &a, &b, &c);

  if(a>=b && a>=c)

  printf("Largest number = %.2f", a);

  if(b>=a && b>=c)

  printf("Largest number = %.2f", b);

  if(c>=a && c>=b)

  printf("Largest number = %.2f", c);

  return 0;

  }

  实现2:

  /* C program to find largest number using if...else statement */

  #include

  int main(){

  float a, b, c;

  printf("Enter three numbers: ");

  scanf("%f %f %f", &a, &b, &c);

  if (a>=b)

  {

  if(a>=c)

  printf("Largest number = %.2f",a);

  else

  printf("Largest number = %.2f",c);

  }

  else

  {

  if(b>=c)

  printf("Largest number = %.2f",b);

  else

  printf("Largest number = %.2f",c);

  }

  return 0;

  }

  实现3:

  /* C Program to find largest number using nested if...else statement */

  #include

  int main(){

  float a, b, c;

  printf("Enter three numbers: ");

  scanf("%f %f %f", &a, &b, &c);

  if(a>=b && a>=c)

  printf("Largest number = %.2f", a);

  else if(b>=a && b>=c)

  printf("Largest number = %.2f", b);

  else

  printf("Largest number = %.2f", c);

  return 0;

  }

  输出结果相同:

  Enter three numbers: 12.213.45210.193Largest number = 13.45

  13、C语言解一元二次方程

  /* Program to find roots of a quadratic equation when coefficients are entered by user. */

  /* Library function sqrt() computes the square root. */

  #include

  #include /* This is needed to use sqrt() function.*/

  int main()

  {

  float a, b, c, determinant, r1,r2, real, imag;

  printf("Enter coefficients a, b and c: ");

  scanf("%f%f%f",&a,&b,&c);

  determinant=b*b-4*a*c;

  if (determinant>0)

  {

  r1= (-b+sqrt(determinant))/(2*a);

  r2= (-b-sqrt(determinant))/(2*a);

  printf("Roots are: %.2f and %.2f",r1 , r2);

  }

  else if (determinant==0)

  {

  r1 = r2 = -b/(2*a);

  printf("Roots are: %.2f and %.2f", r1, r2);

  }

  else

  {

  real= -b/(2*a);

  imag = sqrt(-determinant)/(2*a);

  printf("Roots are: %.2f+%.2fi and %.2f-%.2fi", real, imag, real, imag);

  }

  return 0;

  输出1:

  Enter coefficients a, b and c: 2.345.6Roots are: -0.87+1.30i and -0.87-1.30i

  输出2:

  Enter coefficients a, b and c: 410Roots are: 0.00 and -0.25

  14、C语言检查是否是闰年

  /* C program to check whether a year is leap year or not using if else statement.*/

  #include

  int main(){

  int year;

  printf("Enter a year: ");

  scanf("%d",&year);

  if(year%4 == 0)

  {

  if( year%100 == 0) /* Checking for a century year */

  {

  if ( year%400 == 0)

  printf("%d is a leap year.", year);

  else

  printf("%d is not a leap year.", year);

  }

  else

  printf("%d is a leap year.", year );

  }

  else

  printf("%d is not a leap year.", year);

  return 0;

  }

  输出1:

  Enter year: 20002000 is a leap year.

  输出2:

  Enter year: 19001900 is not a leap year.

  输出3:

  Enter year: 20122012 is a leap year.

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