我收到警告>隐式声明函数'wait'<当我运行程序它正常工作时,我想明白为什么我收到这个警告？
提前致谢
编辑:我忘了添加包含的库
#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <unistd.h>
void create (char* program, char** arg_list)
{
/* put your code here */
pid_t childPid;
int status;
if((childPid = fork()) < 0){
printf("Failed to fork() --- exiting...\n");
exit(1);
}
else if (childPid == 0){ // --- inside the child process
if(execvp(program, arg_list) < 0){ // Failed to run the command
printf("*** Failed to exec %s\n", program);
exit(1);
}
}
else{ // --- parent process
while(wait(&status) != childPid)
printf("...\n");
} …当我尝试编译我的类时,我收到此错误.我确保有功能原型和变量正确启动,希望有人可以帮助我找出问题所在
g++ -c main.cc
g++ -c BankControl.cc
g++ -c Bank.cc
g++ -c Account.cc
g++ -c View.cc
g++ -c AcctList.cc
g++ -c Customer.cc
g++ -c CustArray.cc
g++ -c Transaction.cc
Transaction.cc: In function ‘int getTransID()’:
Transaction.cc:18:34: error: ‘transID’ was not declared in this scope
int getTransID() { return transID; }
^
Transaction.cc: In function ‘TransType getTType()’:
Transaction.cc:19:34: error: ‘tType’ was not declared in this scope
TransType getTType() { return tType; }
^
Transaction.cc: In function ‘TransState getTState()’:
Transaction.cc:20:34: error: ‘tState’ was not …