# 前言

Cpp编程手册

cplusplus reference

string 引用

# A+B probles的一道Acm题

Description
Calculate a + b
Input
The input will consist of a series of pairs of integers a and b,separated by a space, one pair of integers per line.
Output
For each pair of input integers a and b you should output the sum of a and b in one line,and with one line of output for each line in input.
Sample Input
1 2
3 4

Sample Output
3
7


# 检索出字符串中出现最多的字符，并返回该字符

ASCII共定义了256个代码(从0-255)，从0-32位为控制字符(33个)(ASCII control characters)，从33-127位为可打印字符(95个)(ASCII printable characters)。从0-127是标准的ASCII编码，从128-255是扩展的ASCII编码。