feat: added time example

Author: roscibely

execution_time/fibonacci.c

@@ -0,0 +1,47 @@
+#include <stdio.h>
+#include <time.h>
+
+int fibonacci(int n) {
+    if (n == 0) {
+        return 0;
+    } else if (n == 1) {
+        return 1;
+    } else {
+        return fibonacci(n - 1) + fibonacci(n - 2);
+    }
+}
+
+int fibonacci_iterativo(int n) {
+    int f0 = 0;
+    int f1 = 1;
+    int fn = 0;
+    int i;
+    if (n == 0) {
+        return f0;
+    } else if (n == 1) {
+        return f1;
+    } else {
+        for (i = 2; i <= n; i++) {
+            fn = f0 + f1;
+            f0 = f1;
+            f1 = fn;
+        }
+        return fn;
+    }
+}
+
+int main() {
+    clock_t inicio = clock();
+    int n = 40;
+    printf("Fibonacci(%d) = %d\n", n, fibonacci(n));
+    double tempo = (double)(clock() - inicio) / CLOCKS_PER_SEC;
+    tempo = tempo * 1000; //milisegundos
+    printf("Tempo de execucao: %.5f ms\n", tempo);
+
+    inicio = clock();
+    printf("Fibonacci(%d) = %d\n", n, fibonacci_iterativo(n));
+    tempo = (double)(clock() - inicio) / CLOCKS_PER_SEC;
+    tempo = tempo * 1000; //milisegundos
+    printf("Tempo de execucao: %.5f ms\n", tempo);
+    return 0;
+}

execution_time/tempo.c

@@ -0,0 +1,11 @@
+#include <stdio.h>
+#include <time.h>
+
+int main() {
+    clock_t inicio = clock();
+    // Executar o algoritmo
+    double tempo = (double)(clock() - inicio) / CLOCKS_PER_SEC;
+    tempo = tempo * 1000; //milisegundos
+    printf("Tempo de execucao: %.50f\n", tempo);
+    return 0;
+}