Arrays in C

Let’s say we have a random list of numbers: 2, 10, 35, 100

In an array, we don’t call “2” the 1st number, “10” the 2nd number, “35” the third number, and more. 

In an array, we call “2” the 0 number, “10” the 1st number, “35” the 2nd number, and ongoing. 

Array Declaration:

2, 10, 35, 100 is declared as Arr[4] 

Declaring Integer Array Code Example : 

#include <stdio.h>

int main()

{

int arr[5];

return 0;

}

Declaring Character Array Code Example : 

#include <stdio.h>

int main()

{

char arr[5];

return 0;

}

When we want to declare an array of numbers, we can: 

#include <stdio.h>

int main()

{

int arr[5] = {1, 2, 3, 4, 5}; 

return 0;

}

When we want to use ARRAY + LOOP:

#include <stdio.h>

int main()

{

float arr[5];

for (int x = 0; x < 5; x++) 

{

arr[x] = (float)x * 3.3;

}

return 0;

}

When we want to call array: 

#include <stdio.h>

int main()

{

int arr[4] = { 2, 10, 35, 100};

printf("The number at arr[2]: %d \n", arr[2]);

printf("The number at arr[1]: %d \n", arr[1]);

printf("The number at arr[0]: %d", arr[0]);

Return 0; 

}

*Reminder that “\n” is skipping a line 

Output:

The number at arr[2]: 35

The number at arr[1]: 10

The number at arr[0]: 2

APPLICATION TIME!

• Go to replit(make a free account), choose c, and start coding

  • Today’s challenge: 

    • Write an array and calculate the average of all the numbers within the array!