C Basic Commands - W3colleges

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:

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

#include <stdio.h>

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

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;
}

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;
}
```

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;
}

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;
}

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;
}

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;
}

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;
}

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;
}

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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