用C语言程序系统设计:武汉晴川学院十佳歌手比赛成绩系统。设计要求:1、建立成绩输入，按照“去掉一个最低分，去掉一个最高分求平均成绩的”计算方法计算排名成绩；2、输出选手信息（包括选手编号、各评委给分、最后成绩）；3、输出排名信息（对2中已有信息进行排名、输出名次）；4、根据选手编号进行成绩以及相关信息的查询。设计说明:1、程序的主函数实现:输入选手和评委个数（选手不超过20人，评委在3～6人之间）输入每一位评委为选手的打分情况并计算选手最终得分，利用switch语句调用3个自定义函数以及退出；2、自定义函

数1:计算选手最终得分，去掉一个最低分和一个最高分，求平均分；
3、自定义函数2:输出选手信息；
4、自定义函数3:输出排名信息，对选手成绩进行排名，输出名次；
5、自定义函数4:根据选手编号进行成绩以及相关信息的查询。

以下是一个简单的C语言程序系统设计，实现武汉晴川学院十佳歌手比赛成绩系统：

#include <stdio.h>

#define MAX_JUDGE_NUM 6
#define MAX_PLAYER_NUM 20

float calculateScore(float score[], int judgeNum);
void printPlayerInfo(int playerId, float score[], float finalScore);
void printRankingInfo(int playerId[], float score[], float finalScore[], int playerNum);
int searchPlayer(int playerId[], int playerNum, int searchId);

int main() {
    int judgeNum, playerNum, choice;
    float score[MAX_JUDGE_NUM], finalScore[MAX_PLAYER_NUM];
    int playerId[MAX_PLAYER_NUM];

    printf("请输入评委人数（3-6）：");
    scanf("%d", &judgeNum);

    printf("请输入选手人数（不超过20人）：");
    scanf("%d", &playerNum);

    printf("请输入选手编号和打分：\n");
    for (int i = 0; i < playerNum; i++) {
        printf("选手编号：");
        scanf("%d", &playerId[i]);

        printf("打分：");
        for (int j = 0; j < judgeNum; j++) {
            scanf("%f", &score[j]);
        }

        finalScore[i] = calculateScore(score, judgeNum);
    }

    while (1) {
        printf("\n请选择：\n");
        printf("1. 输出选手信息\n");
        printf("2. 输出排名信息\n");
        printf("3. 根据选手编号查询\n");
        printf("4. 退出\n");

        scanf("%d", &choice);

        switch (choice) {
            case 1:
                for (int i = 0; i < playerNum; i++) {
                    printPlayerInfo(playerId[i], score, finalScore[i]);
                }
                break;
            case 2:
                printRankingInfo(playerId, score, finalScore, playerNum);
                break;
            case 3:
                int searchId;
                printf("请输入选手编号：");
                scanf("%d", &searchId);

                int index = searchPlayer(playerId, playerNum, searchId);
                if (index == -1) {
                    printf("没有找到该选手！\n");
                } else {
                    printPlayerInfo(playerId[index], score, finalScore[index]);
                }
                break;
            case 4:
                return 0;
            default:
                printf("选择无效！\n");
        }
    }
}

float calculateScore(float score[], int judgeNum) {
    float minScore = score[0], maxScore = score[0], totalScore = score[0];

    for (int i = 1; i < judgeNum; i++) {
        if (score[i] < minScore) {
            minScore = score[i];
        }
        if (score[i] > maxScore) {
            maxScore = score[i];
        }

        totalScore += score[i];
    }

    return (totalScore - minScore - maxScore) / (judgeNum - 2);
}

void printPlayerInfo(int playerId, float score[], float finalScore) {
    printf("选手编号：%d\n", playerId);
    printf("打分：");
    for (int i = 0; i < MAX_JUDGE_NUM; i++) {
        printf("%.1f ", score[i]);
    }
    printf("\n");
    printf("最终得分：%.1f\n", finalScore);
}

void printRankingInfo(int playerId[], float score[], float finalScore[], int playerNum) {
    int ranking[MAX_PLAYER_NUM];
    for (int i = 0; i < playerNum; i++) {
        ranking[i] = 1;
        for (int j = 0; j < playerNum; j++) {
            if (finalScore[j] > finalScore[i]) {
                ranking[i]++;
            }
        }
    }

    printf("排名信息：\n");
    printf("名次\t选手编号\t最终得分\n");
    for (int i = 0; i < playerNum; i++) {
        printf("%d\t%d\t\t%.1f\n", ranking[i], playerId[i], finalScore[i]);
    }
}

int searchPlayer(int playerId[], int playerNum, int searchId) {
    for (int i = 0; i < playerNum; i++) {
        if (playerId[i] == searchId) {
            return i;
        }
    }

    return -1;
}

该程序实现了计算选手最终得分、输出选手信息、输出排名信息、根据选手编号进行成绩以及相关信息的查询等功能。其中，calculateScore函数计算选手最终得分，printPlayerInfo函数输出选手信息，printRankingInfo函数输出排名信息，searchPlayer函数根据选手编号进行成绩以及相关信息的查询。程序通过循环实现了用户选择不同功能的操作。