Satrlar

#include <stdio.h>

int main(void) {
    char ism[] = "Husanboy";

    printf("Satr        : %s\n", ism);
    printf("Xotira hajmi: %zu bayt\n", sizeof(ism));
    printf("Birinchi harf: %c\n", ism[0]);
    printf("Uchinchi harf: %c\n", ism[2]);

    return 0;
}

#include <stdio.h>

int main(void) {
    char a[] = "Salom";            /* massiv - o'zgartirish mumkin */
    char b[20] = "Salom";          /* katta massiv - joy zaxira bilan */
    const char *c = "Salom";       /* ko'rsatkich - faqat o'qish */

    a[0] = 'K';                    /* mumkin */
    printf("a = %s\n", a);

    b[0] = 'M';                    /* mumkin */
    printf("b = %s\n", b);

    /* c[0] = 'T';   XATO: doimiy satrni o'zgartirib bo'lmaydi */
    printf("c = %s\n", c);

    printf("sizeof(a) = %zu\n", sizeof(a));
    printf("sizeof(b) = %zu\n", sizeof(b));

    return 0;
}

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

int main(void) {
    char ism[50] = "Husanboy";

    printf("strlen  : %zu\n", strlen(ism));
    printf("sizeof  : %zu\n", sizeof(ism));

    return 0;
}

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

int main(void) {
    char manba[] = "Husanboy Qodirov";
    char maqsad[50];

    /* maqsad = manba;   XATO: massivni tenglashtirib bo'lmaydi */

    strcpy(maqsad, manba);
    printf("Nusxa: %s\n", maqsad);

    /* xavfsizroq shakl */
    char qisqa[10];
    strncpy(qisqa, manba, sizeof(qisqa) - 1);
    qisqa[sizeof(qisqa) - 1] = '\0';    /* nolni qo'lda qo'yamiz */
    printf("Qisqa: %s\n", qisqa);

    return 0;
}

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

int main(void) {
    char toliq[100] = "Husanboy";

    strcat(toliq, " ");
    strcat(toliq, "Qodirov");

    printf("To'liq ism: %s\n", toliq);
    printf("Uzunlik   : %zu\n", strlen(toliq));

    return 0;
}

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

int main(void) {
    char a[] = "olma";
    char b[] = "olma";
    char c[] = "anor";

    printf("strcmp(a, b) = %d\n", strcmp(a, b));
    printf("strcmp(a, c) = %d\n", strcmp(a, c) > 0 ? 1 : -1);
    printf("strcmp(c, a) = %d\n", strcmp(c, a) > 0 ? 1 : -1);

    if (strcmp(a, b) == 0) {
        printf("a va b bir xil\n");
    }

    return 0;
}

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

int main(void) {
    char matn[] = "Husanboy Qodirov, Namangan";

    char *probel = strchr(matn, ' ');
    if (probel != NULL) {
        printf("Birinchi probel indeksi: %ld\n", probel - matn);
    }

    char *shahar = strstr(matn, "Namangan");
    if (shahar != NULL) {
        printf("Shahar topildi: %s\n", shahar);
    }

    if (strstr(matn, "Toshkent") == NULL) {
        printf("Toshkent topilmadi\n");
    }

    return 0;
}

#include <stdio.h>
#include <ctype.h>

int main(void) {
    char matn[] = "Salom, C tili 2026!";

    int harflar = 0, raqamlar = 0, probellar = 0, boshqa = 0;

    for (int i = 0; matn[i] != '\0'; i++) {
        if (isalpha((unsigned char) matn[i])) {
            harflar++;
        } else if (isdigit((unsigned char) matn[i])) {
            raqamlar++;
        } else if (isspace((unsigned char) matn[i])) {
            probellar++;
        } else {
            boshqa++;
        }
    }

    printf("Harflar   : %d\n", harflar);
    printf("Raqamlar  : %d\n", raqamlar);
    printf("Probellar : %d\n", probellar);
    printf("Boshqa    : %d\n", boshqa);

    return 0;
}

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

int main(void) {
    char matn[] = "Husanboy Qodirov";
    char katta[50];
    char kichik[50];

    strcpy(katta, matn);
    strcpy(kichik, matn);

    for (int i = 0; katta[i] != '\0'; i++) {
        katta[i] = (char) toupper((unsigned char) katta[i]);
    }

    for (int i = 0; kichik[i] != '\0'; i++) {
        kichik[i] = (char) tolower((unsigned char) kichik[i]);
    }

    printf("Asl    : %s\n", matn);
    printf("Katta  : %s\n", katta);
    printf("Kichik : %s\n", kichik);

    return 0;
}

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

int main(void) {
    char matn[] = "Husanboy";
    size_t uzunlik = strlen(matn);

    for (size_t i = 0; i < uzunlik / 2; i++) {
        char vaqtinchalik = matn[i];
        matn[i] = matn[uzunlik - 1 - i];
        matn[uzunlik - 1 - i] = vaqtinchalik;
    }

    printf("Teskari: %s\n", matn);
    return 0;
}

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

int main(void) {
    const char *raqam_matni = "1234";
    const char *kasr_matni = "3.14";

    int son = atoi(raqam_matni);
    double kasr = atof(kasr_matni);

    printf("atoi : %d\n", son);
    printf("atof : %.2f\n", kasr);

    /* xavfsizroq usul - xatoni aniqlaydi */
    char *qolgan;
    long xavfsiz = strtol("42abc", &qolgan, 10);

    printf("strtol: %ld, qolgan qism: \"%s\"\n", xavfsiz, qolgan);

    return 0;
}

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

int main(void) {
    const char *talabalar[] = {
        "Husanboy Qodirov",
        "Malika Yusupova",
        "Nodira Sobirova",
        "Aziza Tosheva"
    };

    int soni = sizeof(talabalar) / sizeof(talabalar[0]);

    printf("Talabalar ro'yxati:\n");
    for (int i = 0; i < soni; i++) {
        printf("%d. %-20s (%zu belgi)\n", i + 1, talabalar[i], strlen(talabalar[i]));
    }

    /* eng uzun ismni topamiz */
    int eng_uzun = 0;
    for (int i = 1; i < soni; i++) {
        if (strlen(talabalar[i]) > strlen(talabalar[eng_uzun])) {
            eng_uzun = i;
        }
    }

    printf("\nEng uzun ism: %s\n", talabalar[eng_uzun]);

    return 0;
}