First commit

IUT/Info1/TD/Exercices/7.2_selon/calc.cpp

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+#include <limits>
+#include "calc.h"
+
+float add(float a, float b) {
+    return a + b;
+}
+
+float sub(float a, float b) {
+    return a - b;
+}
+
+float mul(float a, float b) {
+    return a * b;
+}
+
+float div(float a, float b) {
+    if (b != 0) {
+        return a / b;
+    }
+    return std::numeric_limits<double>::infinity();
+}