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Код

#include <cstdio>
#include <stdio.h>
#include <string.h>
#include <windows.h>
#include <iostream>
    
#define STRLEN 255
#define LEN 1000
    
int main(void){
    char str[STRLEN], wrd[STRLEN], *p;
    size_t count_all, count_word;
    
    SetConsoleCP(1251);
    SetConsoleOutputCP(1251);
    
    printf("Massiv: ");
    fgets(str, sizeof(str), stdin);
    if ( p = strrchr(str, '\n') )
        *p = '\0';
    printf("Slovo: ");
    fgets(wrd, sizeof(wrd), stdin);
    if ( p = strrchr(wrd, '\n') )
        *p = '\0';
    
    count_all = count_word = 0;
    for ( p = strtok(str, " "); p != NULL; p = strtok(NULL, " ") ){
        ++count_all;
        if ( !strcmp(p, wrd) )
            ++count_word;
    }
    printf("Vsego slov: %d\n", count_all);
    printf("Slovo \"%s\" vstretilos %d raz(a)\n", wrd, count_word);
    
    return 0;}
    

     int main()
    {
        char sin[LEN] = {'\0'};
        char sout[LEN] = {'\0'};
        char *p;
        char swap[LEN];
        char a[LEN / 10][LEN];
        
        int k = -1, i, l, r;
        
        printf("Vvedite massiv: ");
        gets(sin);
        p = strtok(sin, " ");
        while(p)
        {
            k++;
            strcpy(a[k], p);
            p = strtok(NULL, " ");
        }
        printf("\nVvedite nomera slov dlya obmena(l <= r): ");
        scanf("%d %d", &l, &r);
        if(l > r)
        {
            printf("\n\nInput ERROR! Program close!");
            return 1;
        }
        strcpy(swap, a[l - 1]);
        strcpy(a[l - 1], a[r - 1]);
        strcpy(a[r - 1], swap);
        for(i = 0; i < k; i++)
        {
            strcat(sout, a[i]);
            strcat(sout, " ");
        }
        strcat(sout, a[k]);
        printf("\n\nMassiv: %s", sout);
        return 0;
    }