move exercises and lectures into subfolders

Exercises/C7/Getchar/getchar_example.c

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+#include <stdio.h>
+#include <stdlib.h>
+
+int main(void)
+{
+    // declare variable
+    char c;
+
+    printf("Input a character: ");
+    // Wait for a kepypress, store result in c
+    c = getchar();
+
+    // Display on the screen using printf
+    printf ("The charcter pressed was %c\n", c);
+
+    // Display the charcter using putchar()
+    putchar(c);
+    
+    return 0;	    // Exit from main
+}

Exercises/C7/Scanf1/scanf_example_1.c

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+#include <stdio.h>
+#include <stdlib.h>
+
+int main(void)
+{
+    int a;		    // Declare some variables
+    float f;
+
+    // Use printf to prompt the use to enter an integer
+    printf ("Please enter an integer\n");
+    
+    // use scanf with %d to read into 'a' 
+    scanf ("%d",&a);	// note the important & 
+    
+    // And display on the screen
+    printf ("The value you entered for a is %d\n", a);
+    
+	// Use printf to prompt the use to enter an float
+    printf ("Please enter a float\n");
+    
+    // use scanf with %f to read into 'f' 
+    scanf ("%f",&f);  // note the important & 
+    
+    // And display on the screen
+    printf ("The value you entered for f is %f\n", f);
+
+    return 0;     // Exit from main
+}

Exercises/C7/Scanf2/scanf_example_2.c

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+#include <stdio.h>
+
+int main(void)
+{
+    // Declare some variables
+    int a,b,c;
+    float f,g;
+
+    // Use printf to prompt the use to enter 3 integers
+    printf ("Please enter three integer\n");
+    
+    // use scanf with %d to read into a, b and c
+    scanf ("%d %d %d",&a, &b, &c);	// note the important & 
+    
+    // And display on the screen
+    printf ("The values entered were %d %d %d\n", a, b, c);
+    
+	// Use printf to prompt the use to enter an float
+    printf ("Please enter two floats\n");
+    
+	// use scanf with %f to read into f ang g
+    scanf ("%f %f",&f, &g);  // note the important & 
+    
+	// And display on the screen
+    printf ("The value you entered were %f and %f \n", f,g);
+    
+    return 0;	// Exit from main
+}

Exercises/C7/ex2.c

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+#include <stdio.h>
+#include <math.h>
+
+int main() {
+	float r;
+	printf("Enter radius: ");
+	scanf("%f", &r);
+
+	printf("Area of circle: %f\n", M_PI*r*r);
+	printf("Volume of sphere: %f\n", M_PI*r*r*r*4.0/3.0);
+}

Exercises/C7/ex3.c

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+#include <stdio.h>
+#include <math.h>
+
+int main() {
+	float radius, height;
+
+	printf("Enter radius: ");
+	scanf("%f", &radius);
+	printf("Enter height: ");
+	scanf("%f", &height);
+
+	printf("Surface area: %f\n", 2*M_PI*radius*radius + 2*M_PI*radius*height);
+}

Exercises/C7/ex4.c

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+#include <stdio.h>
+
+int main() {
+	char name[200] = { 0 };
+
+	printf("What is your name? ");
+	scanf("%s", name);
+
+	printf("Hello %s\n", name);
+
+}

Exercises/C7/ex5.c

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+#include <stdio.h>
+
+int main() {
+	char name[200] = { 0 };
+	int age = 0;
+
+	printf("What is your name? ");
+	scanf("%s", name);
+
+	printf("What is your age? ");
+	scanf("%ud", &age);
+
+	printf("Hello %s\nYou are %d years old\n", name, age);
+
+}

Exercises/C7/string_with_gets.c

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+#include <stdio.h> 
+#include <stdlib.h>
+int main() 
+{ 
+	// Declare variable - maximum 99 characters
+    char str[100]; 
+    
+    // Prompt for text
+    printf("enter some text\n"); 
+    
+    // Store intput in str 
+    gets(str); 
+    
+    // Display a message on the screen
+    printf("you entered : %s\n", str); 
+    
+    // Exit from main
+    return 0; 
+} 

Exercises/C7/string_with_scanf.c

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+#include <stdio.h>
+#include <stdlib.h>
+
+int main(void)
+{
+    // Declare some variables
+    char name[50];
+
+    // Wait for a kepypress, store result in c
+    printf ("Please enter your name");
+
+    // read in using scanf with %s
+    scanf ("%s",name);
+
+    // Display on the screen using printf
+    printf ("Hello %s\n", name);
+
+    // Exit from main
+    return 0;
+}