my first proj to show the water level in water tank

各种C语言的基本例程，包括九九乘法表，坦克游戏地图设计，降雨计算，检测输入字母等等。十分适合新手看。-Various C language basic routines, including the multiplication table, tank game map design, rainfall calculation, detection of input letters and so on. Very suitable for beginners to see.