feat: Initial commit

Laboratorio 1/calcolatrice.c

@@ -0,0 +1,43 @@
+#include <stdio.h>
+int main()
+{
+    char operation;
+    float op1, op2, res;
+
+    operation = getchar();
+    if (scanf("%f %f", &op1, &op2) != 2) {
+        printf("Error: Invalid input\n");
+        return 2;
+    }
+
+    switch (operation)
+    {
+    case '+':
+        res = op1 + op2;
+        break;
+
+    case '-':
+        res = op1 - op2;
+        break;
+
+    case '*':
+        res = op1 * op2;
+        break;
+
+    case '/':
+        if (op2 == 0) {
+            printf("Error: divide by zero\n");
+            return 2;
+        }
+        res = op1 / op2;
+        break;
+    
+    default:
+        printf("Error: invalid operation\n");
+        return 1;
+    }
+
+    printf("%c %f\n", operation, res);
+
+    return 0;
+}