【发布时间】：2011-06-07 15:25:27
【问题描述】：
我有以下代码，其中包含一个带有数据的结构数组来进行一些计算。当我编译代码时，我收到消息[Warning] converting to 'int' from 'double'。我想用代码解决这个问题，但我不确定问题出在哪里。我不确定这个警告是否太大了，但我认为这种转换也可能导致我的计算出现一些差异。
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <math.h>
int main()
{
int i,aplha[90],beta[90];
double gamma[90],delta[90],epsilon[90],zeta[90];
struct wmm
{
int alpha;
int beta;
double gamma;
double delta;
double epsilon;
double zeta;
}book[]={
{1, 0, -29496.6, 0.0, 11.6, 0.0},
{1, 1, -1586.3, 4944.4, 16.5, -25.9},
{2, 0, -2396.6, 0.0, -12.1, 0.0},
{2, 1, 3026.1, -2707.7, -4.4, -22.5},
{2, 2, 1668.6, -576.1, 1.9, -11.8},
{3, 0, 1340.1, 0.0, 0.4, 0.0},
{3, 1, -2326.2, -160.2, -4.1, 7.3},
{3, 2, 1231.9, 251.9, -2.9, -3.9},
{3, 3, 634.0, -536.6, -7.7, -2.6},
{4, 0, 912.6, 0.0, -1.8, 0.0},
{4, 1, 808.9, 286.4, 2.3, 1.1},
{4, 2, 166.7, -211.2, -8.7, 2.7},
{4, 3, -357.1, 164.3, 4.6, 3.9},
{4, 4, 89.4, -309.1, -2.1, -0.8},
{5, 0, -230.9, 0.0, -1.0, 0.0},
{5, 1, 357.2, 44.6, 0.6, 0.4},
{5, 2, 200.3, 188.9, -1.8, 1.8},
{5, 3, -141.1, -118.2, -1.0, 1.2},
{5, 4, -163.0, 0.0, 0.9, 4.0},
{5, 5, -7.8, 100.9, 1.0, -0.6},
{6, 0, 72.8, 0.0, -0.2, 0.0},
{6, 1, 68.6, -20.8, -0.2, -0.2},
{6, 2, 76.0, 44.1, -0.1, -2.1},
{6, 3, -141.4, 61.5 , 2.0, -0.4},
{6, 4, -22.8, -66.3, -1.7, -0.6},
{6, 5, 13.2, 3.1, -0.3, 0.5},
{6, 6, -77.9, 55.0, 1.7, 0.9},
{7, 0, 80.5, 0.0, 0.1, 0.0},
{7, 1, -75.1, -57.9, -0.1, 0.7},
{7, 2 -4.7, -21.1, -0.6, 0.3},
{7, 3, 45.3, 6.5, 1.3, -0.1},
{7, 4, 13.9, 24.9, 0.4, -0.1},
{7, 5, 10.4, 7.0, 0.3, -0.8},
{7, 6, 1.7, -27.7, -0.7, -0.3},
{7, 7, 4.9, -3.3, 0.6, 0.3},
{8, 0, 24.4, 0.0, -0.1, 0.0},
{8, 1, 8.1, 11.0, 0.1, -0.1},
{8, 2, -14.5, -20.0, -0.6, 0.2},
{8, 3, -5.6, 11.9, 0.2, 0.4},
{8, 4, -19.3, -17.4, -0.2, 0.4},
{8, 5, 11.5, 16.7, 0.3, 0.1},
{8, 6, 10.9, 7.0, 0.3, -0.1},
{8, 7, -14.1, -10.8, -0.6, 0.4},
{8, 8, -3.7, 1.7, 0.2, 0.3},
{9, 0, 5.4, 0.0, 0.0, 0.0},
{9, 1, 9.4, -20.5, -0.1, 0.0},
{9, 2, 3.4, 11.5, 0.0, -0.2},
{9, 3, -5.2, 12.8, 0.3, 0.0},
{9, 4, 3.1, -7.2, -0.4, -0.1},
{9, 5, -12.4, -7.4, -0.3, 0.1},
{9, 6, -0.7, 8.0, 0.1, 0.0},
{9, 7, 8.4, 2.1, -0.1, -0.2},
{9, 8, -8.5, -6.1, -0.4, 0.3},
{9, 9, -10.1, 7.0, -0.2, 0.2},
{10, 0, -2.0, 0.0, 0.0, 0.0},
{10, 1, -6.3, 2.8, 0.0, 0.1},
{10, 2, 0.9, -0.1, -0.1, -0.1},
{10, 3, -1.1, 4.7, 0.2, 0.0},
{10, 4, -0.2, 4.4, 0.0, -0.1},
{10, 5, 2.5, -7.2, -0.1, -0.1},
{10, 6, -0.3, -1.0, -0.2, 0.0},
{10, 7, 2.2, -3.9, 0.0, -0.1},
{10, 8, 3.1, -2.0, -0.1, -0.2},
{10, 9, -1.0, -2.0, -0.2, 0.0},
{10, 10, -2.8, -8.3, -0.2, -0.1},
{11, 0, 3.0, 0.0, 0.0, 0.0},
{11, 1, -1.5, 0.2, 0.0, 0.0},
{11, 2, -2.1, 1.7, 0.0, 0.1},
{11, 3, 1.7, -0.6, 0.1, 0.0},
{11, 4, -0.5, -1.8, 0.0, 0.1},
{11, 5, 0.5, 0.9, 0.0, 0.0},
{11, 6, -0.8, -0.4, 0.0, 0.1},
{11, 7, 0.4, -2.5, 0.0, 0.0},
{11, 8, 1.8, -1.3, 0.0, -0.1},
{11, 9, 0.1, -2.1, 0.0, -0.1},
{11, 10, 0.7, -1.9, -0.1, 0.0},
{11, 11, 3.8, -1.8, 0.0, -0.1},
{12, 0, -2.2, 0.0, 0.0, 0.0},
{12, 1, -0.2, -0.9, 0.0, 0.0},
{12, 2, 0.3, 0.3, 0.1, 0.0},
{12, 3, 1.0, 2.1, 0.1, 0.0},
{12, 4, -0.6, -2.5, -0.1, 0.0},
{12, 5, 0.9, 0.5, 0.0, 0.0},
{12, 6, -0.1, 0.6, 0.0, 0.1},
{12, 7, 0.5, 0.0, 0.0, 0.0},
{12, 8, -0.4, 0.1, 0.0, 0.0},
{12, 9, -0.4, 0.3, 0.0, 0.0},
{12, 10, 0.2, -0.9, 0.0, 0.0},
{12, 11, -0.8, -0.2, -0.1, 0.0},
{12, 12, 0.0, 0.9, 0.1, 0.0}};
}
【问题讨论】：
-
使用 gcc，我无法生成您报告的警告。如果我添加选项 -Wall -Wextra，我只能看到未使用的变量警告和“警告：缺少成员 main()::wmm::zeta 的初始化程序”。
-
无法重现该警告（GCC 4.3.4，
-Wall -Wextra）。 -
如果您认为警告可能会影响您的计算，我建议您要做的是识别和理解警告，而不是抑制警告。
-
@DevSolar：哇，我在 GCC 4.6 (mingw-w64,
-std=c++0x -pedantic -Wextra -Wall -Wconversion -Weffc++ -Wmissing-include-dirs -Wstrict-aliasing) 中遇到错误：narrowing conversion of '-2.70000000000000017763568394002504646778106689453e+0' from 'double' to 'int' inside { } [-fpermissive]这很奇怪，因为没有-2.7。嗯... -
@Greg 这就是我想做的，但是我找不到任何地方我混淆了我的整数和双打
标签： c arrays warnings structure