C programming tutorial.

TASKS/.gitignore

@@ -0,0 +1,2 @@
+*.exe
+*.o

TASKS/Task 001.c

@@ -4,4 +4,18 @@ Write a program that prints the alphabet in lowercase, followed by a new line.
 Print all the letters except q and e
 
 use printf
-*/
+*/
+#include <stdio.h>
+
+int main(void)
+{
+    char alpha;
+
+    for (alpha = 'a'; alpha <= 'z'; alpha++)
+    {
+        if (alpha != 'e' && alpha != 'q')
+            printf("%c ", alpha);
+    }
+    printf("\n");
+    return(0);
+}

TASKS/Task 002.c

@@ -3,4 +3,27 @@ Write a program that asks and reads the score of a user
 If the score is less than 80, display to the user that they
 are not elgible to be enrolled.
 If the score is greater than or equal 80, they can be enrolled.
-*/
+*/
+#include<stdio.h>
+int main()
+{
+    int check;
+
+    printf("What is your score ?");
+    scanf("%i", &check);// take user score
+    user_score(check);
+    return (0);
+}
+
+void user_score(int score)
+{
+    // check if score is less than 80
+    if (score < 80)
+    {
+        printf("You are not eligible");
+    }
+    else// above 80 
+    {
+        printf("You are eligible");
+    }
+}

TASKS/Task 003.c

@@ -6,4 +6,35 @@ If the number is zero, display 'This is zero'
 
 NOTE: 'userInput' should be the number entered by the user.
 
-*/
+*/
+#include<stdio.h>
+void read_int(int num)
+{
+    // check if num is even
+    if (num % 2 == 0)
+    {
+        printf("%i is an even number\n", num);
+    }
+    else if (num % 2 == 1)
+    {
+        printf("%i is an odd number\n", num);
+    }
+    else if (num == 0)
+    {
+        printf("The number is Zero (%i)\n", num);
+    }
+    else
+    {
+        printf("unknown input!\n");
+    }
+}
+
+int main(void)
+{
+    int check;
+
+    printf("Choose your lucky number!: ");
+    scanf("%i", &check);
+    read_int(check);
+    return (0);
+}

TASKS/Task 004.c

@@ -11,4 +11,23 @@ How old are you?: 65
 Output:
 Your name is David and you are 65 years old.
 
-*/
+*/
+// char  user_profile(char name, int age)
+// {
+//     printf("Your name is %s and you are %i years old!\n", name, age);
+// }
+
+int main(void)
+{
+    int age;
+    char name[100];
+
+    printf("What is your name?");
+    scanf("%s", name);
+    printf("How old are you?");
+    scanf("%i", &age);
+    // user_profile(name,age);
+     printf("Your name is %s and you are %i years old!\n", name, age);
+    return (0);
+
+}

TASKS/Task 005.c

@@ -1,4 +1,18 @@
 /*
  Write a program in C to find the square of any number
 using the function.
-*/
+*/
+int sq_num(x)
+{
+    return (x * x);
+}
+
+int main(void)
+{
+    int x;
+
+    printf("input a number: ");
+    scanf("%i", &x);
+    printf("The square of %i is %i", x, sq_num(x));
+    return (0);
+}

TASKS/Task 006.c

@@ -1,4 +1,25 @@
 /*
 Write a program in C to check a given number is even
 or odd using the function.
-*/
+*/
+int main(void)
+{
+    int num;
+
+    printf("Input a number \n");
+    scanf("%i", &num);
+    even_odd(num);
+    return (0);
+}
+
+void even_odd(int check)
+{
+    if (check % 2 == 0)
+    {
+        printf("This an even number");
+    }
+    else
+    {
+        printf("This is an odd number");
+    }
+}

TASKS/Task 007.c

@@ -2,4 +2,24 @@
 write your solution after the comment
 Write a function that prints the alphabet, in uppercase,
 followed by a new line.
-*/
+*/
+
+void print_abc(char abc)
+{
+    abc = 'A';
+
+    while (abc <= 'Z')
+    {
+        printf("%c ", abc);
+        abc++;
+    }
+    printf("\n");
+}
+
+int main(void)
+{
+    char abc = 'A';
+
+    print_abc(abc);
+    return (0);
+}

TASKS/Task 008.c

@@ -1,4 +1,23 @@
 /*write your solution after the comment
 Write a function that prints the alphabet, in lowercase
 followed by a new line.
-*/
+*/
+void print_abc(char abc)
+{
+    abc = 'a';
+
+    while (abc <= 'z')
+    {
+        printf("%c ", abc);
+        abc++;
+    }
+    printf("\n");
+}
+
+int main(void)
+{
+    char abc = 'a';
+
+    print_abc(abc);
+    return (0);
+}

TASKS/Task 009.c

@@ -2,4 +2,22 @@
 Write a function that checks for lowercase character.
 That is, when passed in an arguments, it checks if the
 argument is lowercase or uppercase.
-*/
+*/
+#include<stdio.h>
+void _islower(char low)
+{
+    if (low >= 'a' && low <= 'z' )
+        printf("%c - This is in lowercase", low);
+    else
+        printf("This is in uppercase");
+}
+
+int main(void)
+{
+    char let;
+
+    printf("input an argument\n");
+    scanf("%c", &let);
+    _islower(let);
+    return(0);
+}

TASKS/Task 010.c

@@ -2,4 +2,20 @@
 Write a function that computes the absolute
 value of an integer.
 Understand what an absolute value is, before attempting it.
-*/
+*/
+#include<stdio.h>
+int abs(int x)
+{
+    int y;
+
+    y = y * -1;
+    return(y);
+}
+
+int main(void)
+{
+    int z = -3;
+
+    abs(z);
+    return(0);
+}

TASKS/Task 011.c

@@ -6,4 +6,25 @@ Output should look like this;
 9 x 1 = 9
 9 x 2 = 18
 ... and so on till 12
-*/
+*/
+#include<stdio.h>
+void times_table(int times)
+{
+    int i, j;
+
+    for (i = times; i <= times; i++) // outer loop
+    {
+        for (j = 1; j < 12; j++) //inner loop
+        {
+            printf("%02d * %02d = %03d\n", i, j,(i * j));
+        }
+        printf("\n");
+    }
+}
+int main(void)
+{
+    int num;
+    printf("print time table of ");
+    scanf("%d", &num);
+    times_table(num);
+}

TASKS/Task 012.c

@@ -1,4 +1,15 @@
 /*Write your solution after the comment
 Write a function that adds two integers and prints
 the result.
-*/
+*/
+#include<stdio.h>
+int add_int(int x, int y)
+{
+    return(x + y);
+}
+
+int main(void)
+{
+    add_int(4, 5);
+    printf("the addition of %d and %d is %d", 4, 5, add_int(4,5));
+}

TASKS/Task 013.c

@@ -3,4 +3,22 @@ Write a function that prints all natural numbers from n to 100,
 followed by a new line.
 That is n is your argument, it should print from any number
 passed as argument till 100.
-*/
+*/
+#include<stdio.h>
+void natuaral_num(int nat)
+{
+    int i;
+    for (i = nat; i <= 100; i++) // start from the input
+    {
+        printf("%i ", i);
+    }
+    printf("\n");
+}
+int main(void)
+{
+    int n;
+
+    printf("Printing of natural numbers. Choose a number!\n");
+    scanf("%i", &n);
+    natuaral_num(n);
+}

TASKS/Task 014.c

@@ -6,4 +6,20 @@ Your output should look like this;
 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14
 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14
 ...up to 10 times
-*/
+*/
+#include<stdio.h>
+int main(void)
+{
+    int i, j;
+
+    for (i = 0; i < 10; i++) // runs 10 times outer loop
+    {
+        for (j = 0; j < 15; j++) // inner loop
+        {
+            printf("%d ", j); // prints from 0 - 14
+        }
+        printf("\n"); // prints new line after each iteration
+    }
+    printf("\n"); // prints new line after the loop is done
+    return(0);
+}