C

DeitelC/Chapter3/BinaryToDecimal.c

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+#include <stdio.h>
+
+int main(void){
+    int a;
+    int b;
+    int c = 1;
+    int d;
+    int e = 2;
+    printf("Enter binary!(5 or less!)\n");
+    scanf("%d", &a);
+    while (a > 0) {
+        b = a % 10;
+        if (b > 0 && c == 1) {
+            d = b;
+            a /= 10;
+            c++;
+
+        } else if (b > 0 && c != 1) {
+            d += e*b;
+            e *=2;
+            a/=10;
+            c++;
+        } else {
+            e *=2;
+            a/=10;
+        }
+    }
+    printf("%d\n", d);
+}