Try It Yourself - SyntaxStudy Editor

HTML / CSS / JS

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

int write_csv(const char *path)
{
    FILE *f = fopen(path, "w");
    if (!f) { perror(path); return -1; }

fprintf(f, "name,score,grade
");
    fprintf(f, "Alice,%d,%s
", 95, "A");
    fprintf(f, "Bob,%d,%s
",   82, "B");
    fprintf(f, "Carol,%d,%s
", 74, "C");

fclose(f);
    return 0;
}

int read_csv(const char *path)
{
    FILE *f = fopen(path, "r");
    if (!f) { perror(path); return -1; }

char line[128];
    int  row = 0;

while (fgets(line, sizeof(line), f)) {
        /* Strip trailing newline */
        line[strcspn(line, "
")] = '\0';

if (row == 0) {
            printf("Header: %s
", line);
        } else {
            char name[32]; int score; char grade[4];
            if (sscanf(line, "%31[^,],%d,%3s", name, &score, grade) == 3)
                printf("  %-8s score=%-3d grade=%s
",
                       name, score, grade);
        }
        row++;
    }

if (ferror(f)) perror("read error");
    fclose(f);
    return 0;
}

int main(void)
{
    const char *path = "scores.csv";
    if (write_csv(path) == 0)
        read_csv(path);
    return EXIT_SUCCESS;
}