AreYourARobot Algo in C

AreYouARobot/robot.c

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+/* 
+compiles with:
+gcc --std=c11 robot.c -o main
+*/
+
+#include <stdio.h>
+
+#ifdef _WIN32
+#include <Windows.h>
+#else
+#include <unistd.h>
+#endif
+
+
+#define MAX_STRING_SIZE 62
+
+char questions[][MAX_STRING_SIZE] =
+{ 
+    "Ready to know if you are a robot?\n",
+    "What is 2+2?\n",
+    "Good to know that you know basic math, but lets get real...\n",
+    "What is the answer of the universe, life and everything?\n",
+    "I want to believe that you are not a robot. Last Question...\n",
+    "What is the key? Only robots would know\n"
+};
+
+char input_buffer[ 128 ];
+
+//cross-platform sleep
+void sleep_in_secs( const float seconds )
+{
+    const int milliseconds = seconds * 1000;
+    #ifdef _WIN32
+    Sleep(milliseconds);
+    #else
+    usleep(milliseconds*1000);
+    #endif
+}
+
+char* input()
+{
+    int i = 0;
+    //loops until a new-line is hit.
+    //this way we know where the string ended
+    //needed for the comparison later on
+    while (1) {
+        scanf("%c", &input_buffer[i]);
+        if (input_buffer[i] == '\n') {
+            break;
+        } else {
+            i++;
+        }
+    }
+    input_buffer[i] = '\0';
+    return input_buffer;
+}
+
+int str_to_int( char* string )
+{
+   return atoi( string );
+}
+
+void delay_print( char* string )
+{
+    char* letter = string;
+    while( *letter != '\0' )
+    {
+        putchar(*letter);
+        fflush(stdout);
+        ++letter;  
+        sleep_in_secs(0.1);
+    }
+}
+
+char* delay_input( char* string )
+{
+    delay_print(string);
+    return input();
+
+}
+
+void main()
+{
+    delay_print( questions[0] );
+
+    int a1 = str_to_int( delay_input( questions[1] ) );
+    if( a1 == 4)
+    {
+        delay_print( questions[2] );
+        int a2 = str_to_int( delay_input( questions[3] ) ); 
+        if( a2 == 42)
+        {
+            delay_print( questions[4] );
+            char* a3 = delay_input( questions[5] );
+            if( strcmp(a3 , "i'm a robot" ) == 0 ){
+                delay_print("You truly are a robot\n");
+            } else {
+                printf("You aren't a robot\n");
+            }
+        } else {
+            printf("You aren't a robot\n");
+        }
+    } else {
+        printf("You aren't a robot\n");
+    }
+}