C++ (Cpp) kahanSum示例

示例#1

文件： kahansum.c 项目： MatzeB/firm-testsuite

int main()
{
    float test[] = { 1,2,3,4,5,6,7,8,9};
    printf("Result: %f\n", kahanSum(test, sizeof(test)/sizeof(float)));

    return 0;
}

示例#2

文件： kahan.c 项目： dgquintas/my-code-samples

int main(){
    srand( time(NULL) );
    int i;
    float* v = (float*)malloc(N * sizeof(float));

    for(i=0; i < N; i++){
        v[i] = rand() / (float)RAND_MAX;
    }

//    for(i=0; i < N; i++){
//        printf("%f ", v[i]);
//    }
//    printf("\n", v[i]);

    clock_t t0, t1;

    float resTrivial, resKahan, resPairwise;
    char* exact;
    char times[128];
    const int ITERS = 100;

    t0 = clock(); for(i=0;i<ITERS;i++) resTrivial = trivialSum(v, N); t1 = clock();
    printTime(times, t0, t1, ITERS);
    printf("Trivial: %s\n", times);

    t0 = clock(); for(i=0;i<ITERS;i++)resPairwise = pairwiseSum(v, N); t1 = clock();
    printTime(times, t0, t1, ITERS);
    printf("Pairwise: %s\n", times);

    t0 = clock(); for(i=0;i<ITERS;i++)resKahan = kahanSum(v, N); t1 = clock(); 
    printTime(times, t0, t1, ITERS);
    printf("Kahan: %s\n", times);

    exact = mpSum(v, N);

    printf("Trivial:\t %.32f\n", resTrivial);
    printf("Pairwise:\t %.32f\n", resPairwise);
    printf("Kahan:\t\t %.32f\n", resKahan);
    printf("MP:\t\t %s\n", exact);

    free(v);
    free(exact);
    return 0;
}