注意:我确实安装了xcode及其命令行工具。
gcd.cpp:6:20:致命错误:
iostream
:没有这样的文件或目录
运行时是否在终端中出现错误:
g ++ gcd.cpp -o gcd -g -Wall -Werror -pedantic-errors -fmessage-length = 0
我不知道如何解决这个问题。任何人都知道如何解决它?
#include <stdio.h>
#include <iostream>
#include <sstream>
using namespace std;
int gcdRecur(int a, int b) {
if(b == 0)
return a;
else
return gcdRecur(b, a % b);
}
int gcdIter(int a, int b) {
int z;
while(b != 0) {
z = b;
b = a%b;
a = z;
}
return a;
}
int main(int argc, char *argv[]) {
if(argc != 3){
printf("Usage: %s <integer m> <integer n>", argv[0]);
return -1;
}
string m_str = (string) argv[1];
string n_str = (string) argv[2];
istringstream iss;
int m = 0, n = 0;
iss.str(m_str);
// Check if the first argument is an integer
// by giving the istringstream 0
if(!(iss >> m)){
cerr << "Error: The first argument is not a valid integer." << endl;
return -1;
}
iss.clear();
iss.str(n_str);
if(!(iss >> n)){
cerr << "Error: The second argument is not a valid integer." << endl;
return -1;
}
int iter = gcdIter(m, n);
int recur = gcdRecur(m, n);
printf("Iterative: gcd(%d, %d) = %d\nRecursive: gcd(%d, %d) = %d\n", m, n, iter, m, n, recur);
fflush(stdout);
}
更新
运行命令:
g ++ -H gcd.cpp -o gcd -g -Wall -Werror -pedantic-errors -fmessage-length = 0
我现在得到这个输出(如果我切换它的顺序和iostream,它会为sstream做同样的错误):
. /usr/include/stdio.h
.. /usr/include/sys/cdefs.h
... /usr/include/sys/_symbol_aliasing.h
... /usr/include/sys/_posix_availability.h
.. /usr/include/Availability.h
... /usr/include/AvailabilityInternal.h
.. /usr/include/_types.h
... /usr/include/sys/_types.h
.... /usr/include/machine/_types.h
..... /usr/include/i386/_types.h
.... /usr/include/sys/_pthread/_pthread_types.h
.. /usr/include/sys/_types/_va_list.h
.. /usr/include/sys/_types/_size_t.h
.. /usr/include/sys/_types/_null.h
.. /usr/include/sys/stdio.h
.. /usr/include/sys/_types/_off_t.h
.. /usr/include/sys/_types/_ssize_t.h
答案 0 :(得分:1)
您需要确保安装了Xcode命令行工具。从终端运行:
.style
每当我试图弄清楚编译器在Xcode中做了什么时,我总是会去看看Xcode使用的命令是什么。在您的项目中,转到报告导航器(应位于左侧,最右侧的选项卡):
然后找到您感兴趣的文件行:
点击最右边的一小撮煎饼展开: