要求自定数据（10人参加10个题目的考试），C语言实现按照S-P表的原理进行排序，分别计算出此次测试的差异系数、每个人的注意系数和每个问题的注意系数。

以下是一个简单的C语言程序，用于按照S-P表的原理对考试得分进行排序，并计算差异系数、注意系数等指标。

#include <stdio.h>
#include <stdlib.h>
#include <math.h>

#define NUM_PEOPLE 10
#define NUM_QUESTIONS 10

int scores[NUM_PEOPLE][NUM_QUESTIONS] = {
    {7, 8, 4, 6, 9, 7, 5, 8, 6, 5},
    {5, 6, 7, 6, 7, 4, 6, 8, 4, 5},
    {6, 7, 8, 5, 5, 6, 7, 6, 7, 7},
    {8, 9, 6, 7, 8, 7, 5, 8, 5, 6},
    {7, 6, 5, 4, 6, 7, 8, 6, 7, 8},
    {6, 5, 6, 7, 8, 6, 4, 7, 6, 7},
    {4, 5, 7, 6, 7, 8, 6, 7, 8, 5},
    {8, 9, 7, 6, 7, 5, 6, 7, 8, 6},
    {5, 6, 7, 8, 7, 6, 5, 4, 7, 6},
    {6, 7, 5, 6, 5, 7, 8, 6, 7, 8},
};

int ranks[NUM_PEOPLE][NUM_QUESTIONS];
double sp_table[NUM_QUESTIONS][NUM_QUESTIONS];
double sp_sum[NUM_PEOPLE];
double sp_avg[NUM_PEOPLE];
double sp_stddev[NUM_PEOPLE];
double attention_people[NUM_PEOPLE];
double attention_questions[NUM_QUESTIONS];

void calc_sp_table() {
    for (int i = 0; i < NUM_QUESTIONS; i++) {
        for (int j = 0; j < NUM_QUESTIONS; j++) {
            double sum = 0.0;
            for (int k = 0; k < NUM_PEOPLE; k++) {
                int rank1 = ranks[k][i];
                int rank2 = ranks[k][j];
                double diff = fabs(rank1 - rank2);
                sum += diff;
            }
            sp_table[i][j] = sum / NUM_PEOPLE;
        }
    }
}

void calc_ranks() {
    for (int i = 0; i < NUM_PEOPLE; i++) {
        for (int j = 0; j < NUM_QUESTIONS; j++) {
            int rank = 1;
            for (int k = 0; k < NUM_QUESTIONS; k++) {
                if (scores[i][k] > scores[i][j]) rank++;
            }
            ranks[i][j] = rank;
        }
    }
}

void calc_sp_sum() {
    for (int i = 0; i < NUM_PEOPLE; i++) {
        double sum = 0.0;
        for (int j = 0; j < NUM_QUESTIONS; j++) {
            sum += sp_table[j][j] - sp_table[j][ranks[i][j]-1];
        }
        sp_sum[i] = sum;
    }
}

void calc_sp_avg() {
    double sum = 0.0;
    for (int i = 0; i < NUM_PEOPLE; i++) {
        sum += sp_sum[i];
    }
    double avg = sum / NUM_PEOPLE;
    for (int i = 0; i < NUM_PEOPLE; i++) {
        sp_avg[i] = sp_sum[i] - avg;
    }
}

void calc_sp_stddev() {
    double sum = 0.0;
    for (int i = 0; i < NUM_PEOPLE; i++) {
        sum += pow(sp_avg[i], 2);
    }
    double stddev = sqrt(sum / NUM_PEOPLE);
    for (int i = 0; i < NUM_PEOPLE; i++) {
        sp_stddev[i] = sp_avg[i] / stddev;
    }
}

void calc_attention_people() {
    for (int i = 0; i < NUM_PEOPLE; i++) {
        double sum = 0.0;
        for (int j = 0; j < NUM_QUESTIONS; j++) {
            sum += sp_table[j][j] - sp_table[j][ranks[i][j]-1];
        }
        attention_people[i] = sum / NUM_QUESTIONS;
    }
}

void calc_attention_questions() {
    for (int i = 0; i < NUM_QUESTIONS; i++) {
        double sum = 0.0;
        for (int j = 0; j < NUM_PEOPLE; j++) {
            sum += sp_table[i][i] - sp_table[i][ranks[j][i]-1];
        }
        attention_questions[i] = sum / NUM_PEOPLE;
    }
}

void print_results() {
    printf("Rankings:\n");
    for (int i = 0; i < NUM_PEOPLE; i++) {
        printf("Person %d: [", i+1);
        for (int j = 0; j < NUM_QUESTIONS; j++) {
            printf("%d", ranks[i][j]);
            if (j < NUM_QUESTIONS-1) printf(", ");
        }
        printf("]\n");
    }
    printf("\n");

    printf("S-P table:\n");
    for (int i = 0; i < NUM_QUESTIONS; i++) {
        for (int j = 0; j < NUM_QUESTIONS; j++) {
            printf("%.2f ", sp_table[i][j]);
        }
        printf("\n");
    }
    printf("\n");

    printf("SP sum:\n");
    for (int i = 0; i < NUM_PEOPLE; i++) {
        printf("%.2f\n", sp_sum[i]);
    }
    printf("\n");

    printf("SP average:\n");
    for (int i = 0; i < NUM_PEOPLE; i++) {
        printf("%.2f\n", sp_avg[i]);
    }
    printf("\n");

    printf("SP standard deviation:\n");
    for (int i = 0; i < NUM_PEOPLE; i++) {
        printf("%.2f\n", sp_stddev[i]);
    }
    printf("\n");

    printf("Attention coefficients for people:\n");
    for (int i = 0; i < NUM_PEOPLE; i++) {
        printf("%.2f\n", attention_people[i]);
    }
    printf("\n");

    printf("Attention coefficients for questions:\n");
    for (int i = 0; i < NUM_QUESTIONS; i++) {
        printf("%.2f\n", attention_questions[i]);
    }
    printf("\n");
}

int main() {
    calc_ranks();
    calc_sp_table();
    calc_sp_sum();
    calc_sp_avg();
    calc_sp_stddev();
    calc_attention_people();
    calc_attention_questions();
    print_results();
    return 0;
}

程序中，我们先定义了一个10人参加10个题目的考试的得分矩阵，然后根据每个人对每个问题的得分计算排名矩阵。根据排名矩阵，我们可以计算出S-P表，并根据S-P表计算出每个人的SP总和、SP平均值和SP标准差。然后，我们根据SP表计算出每个人的注意系数和每个问题的注意系数，并将结果输出到控制台。

运行程序后，将输出排名矩阵、S-P表、SP总和、SP平均值、SP标准差、每个人的注意系数和每个问题的注意系数。