c - 调用 CLAPACK 函数后变量初始化

Question

我最近设法构建并运行了一个简单的 CLAPACK Microsoft Visual Studio 2008 项目(从 http://icl.cs.utk.edu/lapack-for-windows/lapack/index.html 下载)。之后，在 LAPACK dgesv_ 调用后插入一行以初始化另一个整数 tempInteger 会导致构建失败。错误是:CLAPACK-EXAMPLE.c(30):错误 C2143:语法错误:缺少“；”在“类型”之前。看起来 LAPACK 函数的执行阻止了某些操作，例如之后的变量初始化。谁能帮我了解发生了什么并解决它？提前致谢。代码 list 如下:

#include < stdio.h>
#include "f2c.h"
#include "clapack.h"

int main(void)
{
    /* 3x3 matrix A
     * 76 25 11
     * 27 89 51
     * 18 60 32
     */
    double A[9] = {76, 27, 18, 25, 89, 60, 11, 51, 32};
    double b[3] = {10, 7, 43};

    int N = 3;
    int nrhs = 1;
    int lda = 3;
    int ipiv[3];
    int ldb = 3;
    int info;
    int qqq = 1;

    dgesv_(&N, &nrhs, A, &lda, ipiv, b, &ldb, &info);

    if(info == 0) /* succeed */
    printf("The solution is %lf %lf %lf\n", b[0], b[1], b[2]);
    else
    fprintf(stderr, "dgesv_ fails %d\n", info);

    int tempInteger = 1;

    return info;
}

Answer 1

如果此文件编译为 C 文件而不是 C++ 文件，则应在函数顶部声明 tempInteger 类型。例如:

#include < stdio.h>
#include "f2c.h"
#include "clapack.h"

int main(void)
{
    /* 3x3 matrix A
     * 76 25 11
     * 27 89 51
     * 18 60 32
     */
    double A[9] = {76, 27, 18, 25, 89, 60, 11, 51, 32};
    double b[3] = {10, 7, 43};

    int N = 3;
    int nrhs = 1;
    int lda = 3;
    int ipiv[3];
    int ldb = 3;
    int info;
    int qqq = 1;
    int tempInteger;

    dgesv_(&N, &nrhs, A, &lda, ipiv, b, &ldb, &info);

    if(info == 0) /* succeed */
    printf("The solution is %lf %lf %lf\n", b[0], b[1], b[2]);
    else
    fprintf(stderr, "dgesv_ fails %d\n", info);

    tempInteger = 1;

    return info;
}