1. 解释什么是“non-void function does not return a value”错误 “non-void function does not return a value”错误是指,在C或C++编程中,如果一个函数的返回类型不是void(即函数预期会返回一个值),但在所有可能的执行路径上该函数都没有返回任何值,编译器就会报这个错误。
用clang++编译同样类似警告也通过了,但执行出现异常指令。 gaojie@root-host:~$ clang++bool.cppbool.cpp:12:1: warning: non-voidfunction does notreturna value [-Wreturn-type] };^1warning generated. gaojie@root-host:~$ ./a.outyes 非法指令 (核心已转储) 本着好奇的心理,就想知其原因为啥会有不...
_company_name value is:%d\r\n",g_company_name); return g_company_name; #else printf("g_personal_name value is:%d\r\n",g_personal_name); return g_personal_name; #endif } int main() { int ret = 0; ret = get_company_name(); printf("ret value is:%d\r\n",ret); return 0...
#include <stdio.h> int hello() { return 233; } int print_data(int* data, int len) { for (int i = 0; i < len; i++) { printf("%d ", data[i]); } printf("\n"); // here the return statement is missing, the compiler will generate an UB //hello(); } void example1()...
293 - gen::functionDefinitionEnd(); 293 + if (!gen::functionDefinitionEnd()) { 294 + error::out() << fnName.loc << ": warning: non-void function does not " 295 + << "return a value in all control paths\n"; 296 + } 294 297 } 295 298 296 299 /* gen/func...
The following sample code long offset(long v) { if (!v) return 0; if (v > 0) return 1; if (v < 0) return -1; } produces warning: non-void function does not return a value in all control paths [-Wreturn-type] So does long offset(long v) {...
控制到达非void函数的结尾。 一些本应带有返回值的函内数到容达结尾后可能并没有返回任何值。 这时候,最好检查一下是否每个控制流都会有返回值。 我是ostream声明的时候没有写return out;产生的错误。 参考:https://zhidao.baidu.com/question/1860183282073653227.html...
Void return values Functions are not required to return a value back to the caller. To tell the compiler that a function does not return a value, a return type ofvoidis used. For example: #include<iostream>// void means the function does not return a value to the callervoidprintHi(){...
All exit paths from a function with non-void return type shall have an explicit return statement with an expression. Rationale If a non-void function does not explicitly return a value but the calling function uses the return value, the behavior is undefined. To prevent this behavior: You mus...
control reaches end of non-voi control reaches end of non-void function [-Werror=return-type] [solution.c] 目测原因是因为,没有进行return 的返回。 加上return即可 __EOF__