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practical03/Answer.md

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+### Printf Syntax
+
+```c++
+printf("Two ints %d %d and two floats %f %f\n", int1, int2, float1, float2);
+```
+
+### Exercices
+

practical03/Area.c

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+#include <stdio.h>
+#include <math.h>
+
+int main(void) {
+
+/* Declare variables */
+    int i, N;
+    float value, h, a, b, pi;
+
+/* Initialize the value */
+    pi = atanf(1.0)/4.0;            // Definition of Pi
+    a = 0;
+    b = pi / 3;                     // First values of a and b
+    N = 12;                         // Number of iteration
+
+/* Compute the Sum */
+    h = (b - a) / (N - 1);          // Create 11 equidistants points
+
+    value = 2 * (tan(a) + tan(b));  
+    for (i=0; i < N; i++);          // for loop from 0 to N
+        value += tan(a+h*(i-1));
+
+/* Print the values */
+    printf("The area under the curve is equal to %f \n", value);
+}

practical04/Answer.md

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+### Exercices
+

practical04/Tang.c

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+#include <stdio.h>
+#include <math.h>
+
+float pi;
+float degtorad(float arg);
+
+int main(void) {
+
+/* Declare variables */
+    int i;
+    float degang, radang;
+    float Tan060[13];
+
+/* Loop and store the results in an array */
+    pi = atanf(1.0)/4.0;
+
+    for (i; i<13; i++);
+        degang = i * 5;
+        radang = degtorad(i); // use the function descibred below
+
+        Tan060[i] = tan(radang); 
+
+    printf("Deg %f, Tan %f\n");
+    return 0;
+}
+
+/* Function to convert angle from degrees to radians */
+float degtorad(float arg) {
+    return( (pi * arg)/180.0 );
+}