C语言班费收支管理系统代码有1.输入班费收入或支出的日期，来源，金额，2.班费信息的修改，3.按班费支出或收入的日期查询班费信息，4.班费信息展示并计算班费余额。的功能

以下是一个包含输入日期、来源、金额、修改、查询和展示班费信息以及计算余额的C语言班费收支管理系统代码：

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

#define MAX_RECORDS 100

struct Record {
    char date[20];
    char source[50];
    float amount;
};

struct Record records[MAX_RECORDS];
int num_records = 0;

void add_record() {
    if (num_records >= MAX_RECORDS) {
        printf("Maximum number of records reached!\n");
        return;
    }

    struct Record new_record;
    printf("Enter date (MM/DD/YYYY): ");
    scanf("%s", new_record.date);
    printf("Enter source: ");
    scanf("%s", new_record.source);
    printf("Enter amount: ");
    scanf("%f", &new_record.amount);

    records[num_records++] = new_record;
    printf("Record added successfully!\n");
}

void modify_record() {
    if (num_records == 0) {
        printf("No records found!\n");
        return;
    }

    char date[20];
    printf("Enter date of record to modify (MM/DD/YYYY): ");
    scanf("%s", date);

    for (int i = 0; i < num_records; i++) {
        if (strcmp(records[i].date, date) == 0) {
            printf("Enter new source: ");
            scanf("%s", records[i].source);
            printf("Enter new amount: ");
            scanf("%f", &records[i].amount);
            printf("Record modified successfully!\n");
            return;
        }
    }

    printf("Record not found!\n");
}

void search_record() {
    if (num_records == 0) {
        printf("No records found!\n");
        return;
    }

    char date[20];
    printf("Enter date of record to search (MM/DD/YYYY): ");
    scanf("%s", date);

    printf("Date\t\tSource\t\tAmount\n");
    for (int i = 0; i < num_records; i++) {
        if (strcmp(records[i].date, date) == 0) {
            printf("%s\t%s\t\t%.2f\n", records[i].date, records[i].source, records[i].amount);
            return;
        }
    }

    printf("Record not found!\n");
}

void list_records() {
    if (num_records == 0) {
        printf("No records found!\n");
        return;
    }

    printf("Date\t\tSource\t\tAmount\n");
    for (int i = 0; i < num_records; i++) {
        printf("%s\t%s\t\t%.2f\n", records[i].date, records[i].source, records[i].amount);
    }
}

void calculate_balance() {
    float balance = 0;
    for (int i = 0; i < num_records; i++) {
        balance += records[i].amount;
    }

    printf("Balance: %.2f\n", balance);
}

int main() {
    int choice;

    do {
        printf("\n1. Add record\n2. Modify record\n3. Search record\n4. List records\n5. Calculate balance\n6. Exit\n");
        printf("Enter your choice: ");
        scanf("%d", &choice);

        switch (choice) {
            case 1:
                add_record();
                break;
            case 2:
                modify_record();
                break;
            case 3:
                search_record();
                break;
            case 4:
                list_records();
                break;
            case 5:
                calculate_balance();
                break;
            case 6:
                printf("Exiting program...\n");
                break;
            default:
                printf("Invalid choice!\n");
                break;
        }
    } while (choice != 6);

    return 0;
}

这个程序包含以下功能：

- 添加一条班费记录，包括日期、来源和金额
- 修改一条班费记录的来源和金额
- 查询一条班费记录
- 显示所有的班费记录
- 计算班费余额

你可以根据需要进行修改和扩展。希望这可以对你有所帮助！