C Basic Commands

C is a high-level programming language that was developed in the 1970s and is still widely used today. It is used to develop a wide range of applications, including system software, games, and desktop and mobile applications. Here are some of the most commonly used C commands:

1. printf: This function is used to display output on the screen.
   Example –

   #include <stdio.h>
   
   int main() {
      printf("Hello, World!");
      return 0;
   }
   
   

    

2. scanf: This function is used to read input from the keyboard.
   Example –

   #include <stdio.h>
   
   int main() {
      int a;
      printf("Enter a value: ");
      scanf("%d", &a);
      printf("You entered: %d", a);
      return 0;
   }
   
   

3. main: This is the starting point of a C program. It returns an integer value to indicate the status of the program’s execution.
   Example –
   

   #include <stdio.h>
   
   int main() {
      printf("This is the starting point of the program.");
      return 0;
   }
   
   

4. if: This statement is used to execute a block of code conditionally.
   Example –
   

   #include <stdio.h>
   
   int main() {
      int a = 5;
      if (a > 0) {
         printf("a is positive.");
      }
      return 0;
   }
   
   

5. for: This loop is used to repeat a block of code a specified number of times.
   Example –
   

   #include <stdio.h>
   
   int main() {
      int i;
      for (i = 1; i <= 10; i++) {
         printf("%d ", i);
      }
      return 0;
   }
   
   

6. while: This loop is used to repeat a block of code as long as a condition is true.
   Example –
   

   #include <stdio.h>
   
   int main() {
      int i = 1;
      while (i <= 10) {
         printf("%d ", i);
         i++;
      }
      return 0;
   }
   
   

7. do-while: This loop is similar to a while loop, but the block of code is executed at least once.
   Example –
   

   #include <stdio.h>
   
   int main() {
      int i = 1;
      do {
         printf("%d ", i);
         i++;
      } while (i <= 10);
      return 0;
   }
   
   

8. break: This statement is used to exit a loop early.
   Example –
   

   #include <stdio.h>
   
   int main() {
      int i;
      for (i = 1; i <= 10; i++) {
         if (i == 5) {
            break;
         }
         printf("%d ", i);
      }
      return 0;
   }
   
   

9. continue: This statement is used to skip the current iteration of a loop and move on to the next one.
   Example –
   

   #include <stdio.h>
   
   int main() {
      int i;
      for (i = 1; i <= 10; i++) {
         if (i % 2 == 0) {
            continue;
         }
         printf("%d ", i);
      }
      return 0;
   }
   
   

10. switch: This statement is used to choose between multiple blocks of code to execute based on a value.
    Example –
    

    #include <stdio.h>
    
    int main() {
       int a = 2;
       switch (a) {
          case 1:
             printf("a is 1.");
             break;
          case 2:
             printf("a is 2.");
             break;
          default:
             printf("a is neither 1 nor 2.");
       }
       return 0;
    }
    
    

These are just a few of the many commands available in the C programming language. If you are new to C, it’s a good idea to start by learning these basics before diving into more advanced topics.

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