C Programming Basics: Examples and Explanations
Classified in Computers
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C Programming Basics
Printing a Message
int main() { print("Hello!!!"); }
Variables and Mathematical Calculations
int main() // Main function
{
int a = 25; // Initialize a variable to 25
int b = 17; // Initialize b variable to 17
int c = a + b; // Initialize c variable to a + b
print("c = %d ", c); // Display decimal value of c
}
Floating-Point Math
int main() // Main function
{
float r = 1.0; // Set radius to 1.0
float c = 2.0 * PI * r; // Calculate circumference
print("circumference = %f \n", c); // Display circumference
}
Arrays
int main() // Main function
{
int p[] = {1, 2, 3, 5, 7, 11}; // Initialize the array
print("p[0] = %d\n", p[0]); // Display what p[0] stores
print("p[3] = %d\n", p[3]); // Display what p[3] stores
p[3] = 101; // Assignment
}
If Statements
int main() // Main function
{
int a = -25; // Initialize a variable to 25
int b = -17; // Initialize b variable to 17
print("a = %d, b = %d\n", a, b); // Print all
if(a > b) // If a > b condition is true
{
print("a is larger \n"); // ...then print this message
}
}
While Statement
int main() // Main function
{
int n = 0; // Declare n, initialize to zero
while(n < 200) // Repeat while n is less than 200
{
print("n = %d\n", n); // Display name & value of n
n = n + 5; // Add 5 to n each time through
pause(500); // 0.5 s between repetitions
}
print("All done!"); // Display all done
}
For Statement
int main() // Main function
{
for(int n = 1; n <= 10; n++) // Count to ten
{
print("n = %d\n", n); // Display name & value of n
pause(500); // 0.5 s between reps
}
print("All done!"); // Display all done
}