Question

我最近设法构建并运行一个简单的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_调用之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。似乎执行LAPACK功能会阻止某些操作，例如之后的变量初始化。谁能帮我理解发生了什么并修复它？提前致谢。代码清单如下：

#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;
}

调用CLAPACK函数后的变量初始化

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