{"id":16504,"date":"2024-03-15T13:07:04","date_gmt":"2024-03-15T13:07:04","guid":{"rendered":"https:\/\/www.silicloud.com\/blog\/how-to-read-data-from-a-csv-file-in-the-c-language\/"},"modified":"2025-08-07T03:31:06","modified_gmt":"2025-08-07T03:31:06","slug":"how-to-read-data-from-a-csv-file-in-the-c-language","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/blog\/how-to-read-data-from-a-csv-file-in-the-c-language\/","title":{"rendered":"How to read data from a CSV file in the C language?"},"content":{"rendered":"

To read data from a CSV file in C language, you can follow these steps:<\/p>\n

    \n
  1. Include the necessary header files:<\/li>\n<\/ol>\n
    #include<\/span> <stdio.h><\/span><\/span>\r\n#include<\/span> <stdlib.h><\/span><\/span>\r\n#include<\/span> <string.h><\/span><\/span>\r\n<\/code><\/pre>\n
      \n
    1. Create a structure to store each line of data in a CSV file.<\/li>\n<\/ol>\n
      typedef<\/span> struct<\/span> {<\/span>\r\n    char<\/span> field1[100<\/span>];\r\n    char<\/span> field2[100<\/span>];\r\n    \/\/ \u53ef\u4ee5\u6839\u636e\u9700\u8981\u6dfb\u52a0\u66f4\u591a\u7684\u5b57\u6bb5<\/span>\r\n} CSVData;\r\n<\/code><\/pre>\n
        \n
      1. Write a function to read data from a CSV file.<\/li>\n<\/ol>\n
        void<\/span> readCSV<\/span>(const<\/span> char<\/span>* filename, CSVData* data, int<\/span>* num_rows)<\/span> {\r\n    FILE* file = fopen(filename, \"r\"<\/span>);\r\n    if<\/span> (file == NULL<\/span>) {\r\n        printf<\/span>(\"\u65e0\u6cd5\u6253\u5f00\u6587\u4ef6\u3002\\n\"<\/span>);\r\n        return<\/span>;\r\n    }\r\n\r\n    char<\/span> line[256<\/span>];\r\n    int<\/span> i = 0<\/span>;\r\n\r\n    while<\/span> (fgets(line, sizeof<\/span>(line), file)) {\r\n        \/\/ \u4f7f\u7528strtok\u51fd\u6570\u6309\u7167\u9017\u53f7\u5206\u9694\u6bcf\u4e2a\u5b57\u6bb5<\/span>\r\n        char<\/span>* token = strtok(line, \",\"<\/span>);\r\n        strcpy<\/span>(data[i].field1, token);\r\n        token = strtok(NULL<\/span>, \",\"<\/span>);\r\n        strcpy<\/span>(data[i].field2, token);\r\n        \/\/ \u53ef\u4ee5\u6839\u636e\u9700\u8981\u7ee7\u7eed\u8bfb\u53d6\u66f4\u591a\u7684\u5b57\u6bb5<\/span>\r\n\r\n        i++;\r\n    }\r\n\r\n    *num_rows = i;\r\n\r\n    fclose(file);\r\n}\r\n<\/code><\/pre>\n
          \n
        1. Use the above function to read data from the CSV file.<\/li>\n<\/ol>\n
          int<\/span> main<\/span>()<\/span> {\r\n    CSVData data[100<\/span>];\r\n    int<\/span> num_rows;\r\n    readCSV(\"data.csv\"<\/span>, data, &num_rows);\r\n\r\n    \/\/ \u6253\u5370\u8bfb\u53d6\u5230\u7684\u6570\u636e<\/span>\r\n    for<\/span> (int<\/span> i = 0<\/span>; i < num_rows; i++) {\r\n        printf<\/span>(\"\u7b2c %d \u884c\u6570\u636e\uff1a\\n\"<\/span>, i+1<\/span>);\r\n        printf<\/span>(\"\u5b57\u6bb51\uff1a%s\\n\"<\/span>, data[i].field1);\r\n        printf<\/span>(\"\u5b57\u6bb52\uff1a%s\\n\"<\/span>, data[i].field2);\r\n        \/\/ \u53ef\u4ee5\u6839\u636e\u9700\u8981\u6253\u5370\u66f4\u591a\u7684\u5b57\u6bb5<\/span>\r\n        printf<\/span>(\"\\n\"<\/span>);\r\n    }\r\n\r\n    return<\/span> 0<\/span>;\r\n}\r\n<\/code><\/pre>\n
          The above code assumes that each row in the CSV file only has two fields, which can be adjusted according to the actual situation. Additionally, it is necessary to ensure that the CSV file exists and is in the correct format.<\/p>\n","protected":false},"excerpt":{"rendered":"
          To read data from a CSV file in C language, you can follow these steps: Include the necessary header files: #include <stdio.h> #include <stdlib.h> #include <string.h> Create a structure to store each line of data in a CSV file. typedef struct { char field1[100]; char field2[100]; \/\/ \u53ef\u4ee5\u6839\u636e\u9700\u8981\u6dfb\u52a0\u66f4\u591a\u7684\u5b57\u6bb5 } CSVData; Write a function to read […]<\/p>\n","protected":false},"author":8,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_import_markdown_pro_load_document_selector":0,"_import_markdown_pro_submit_text_textarea":"","footnotes":""},"categories":[1],"tags":[453,1402,299,1404,1403],"class_list":["post-16504","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-development","tag-guide","tag-programming","tag-technology","tag-tutorial"],"yoast_head":"\nHow to read data from a CSV file in the C language? - Blog - Silicon Cloud<\/title>\n<meta name=\"description\" content=\"Learn about how to read data from a csv file in the c language?. 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