init commit

3sem/cnts/contest2/03.c

@@ -0,0 +1,39 @@
+#include <stdio.h>
+#include <stdint.h>
+#include <errno.h>
+#include <stdlib.h>
+#include <math.h>
+
+enum
+{
+    PRCN = 10000,
+};
+
+int
+main(int argc, char *argv[])
+{
+    long double a = 0;
+
+    for (int i = 1; i < argc; i++) {
+        char *p;
+        errno = 0;
+        long double val = strtod(argv[i], &p);
+        if (*p || errno || argv[i] == p) {
+            return 1;
+        }
+
+        if (i == 1) {
+            a = val * PRCN;
+        } else {
+            a = round(a * (100.L + val) / 100.L);
+        }
+    }
+
+    if (argc == 1) {
+        return 1;
+    }
+
+    printf("%.4Lf\n", a / PRCN);
+
+    return 0;
+}