标签：style blog http color io ar strong for div
第五十一题
Write a C function which does the addition of two integers without using the ‘+‘ operator. You can use only the bitwise operators.(Remember the good old method of implementing the full-adder circuit using the or, and, xor gates....)
题目讲解：
参考：
http://www.geeksforgeeks.org/add-two-numbers-without-using-arithmetic-operators/
int Add(int x, int y) { // Iterate till there is no carry while (y != 0) { // carry now contains common set bits of x and y int carry = x & y; // Sum of bits of x and y where at least one of the bits is not set x = x ^ y; // Carry is shifted by one so that adding it to x gives the required sum y = carry << 1; } return x; }
或
int Add(int x, int y) { if (y == 0) return x; else return Add( x ^ y, (x & y) << 1); }
第五十二题
How do you print I can print % using the printf function? (Remember % is used as a format specifier!!!)
题目讲解：
参考：
http://www.geeksforgeeks.org/how-to-print-using-printf/
printf("%%"); printf("%c", ‘%‘); printf("%s", "%");
第五十三题
What‘s the difference between the following two C statements? const char *p; char* const p;
题目讲解：
const char *p:
p指向的值只读；
char* const p:
p的值只读；
第五十四题
What is the difference between memcpy and memmove?
题目讲解：
对重叠区域(overlapping regions)的处理有区别。
第五十五题
What is the format specifiers for printf to print double and float values?
题目讲解：
double: %lf
float: %f
第五十六题
Write a small C program to determine whether a machine‘s type is little-endian or big-endian.
题目讲解：
参考：
http://www.geeksforgeeks.org/little-and-big-endian-mystery/
unsigned int determine_endian() { unsigned int i = 1; char *c = (char *)&i; if (*c) return 0;//little endian else return 1;//big endian }
第五十七题
Write a C program which prints Hello World! without using a semicolon!!!
题目讲解：
#include <stdio.h> int main() { while(printf(“Hello World!”)<0) {} }
标签：style blog http color io ar strong for div
原文地址：http://www.cnblogs.com/tanghuimin0713/p/3989444.html
