stringy.c

/*
    xnagyl2.c
    ZPPLS13
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#define MAX_STR 50

void strinsert(char *s, int d, char *s2, int i);
void strdelete(char *s, int i, int n);


int main()
{
    char s[MAX_STR] = "";
    char s2[MAX_STR] = "";
    char vyber;
    int i, n, d, len;

    while(vyber = getchar())
    {
        if(vyber == 'N')
        {
            scanf("%s", &s);
            printf("%s",s);
        }
        else if(vyber == 'V')
        {
            scanf("%d %s", &i, &s2);
            len = strlen(s2);
            strinsert(s, len, s2, i);
            printf("%s",s);
        }
        else if(vyber == 'Z')
        {
            scanf("%d %d", &i, &n);
            strdelete(s, i, n);
            printf("%s\n",s);
        }
        else if(vyber == 'K')
        {
            break;
        }
    }
    return 0;
}


void strinsert(char *s, int d, char *s2, int i)
{
    int len;
    char *str;
    str = (char *)malloc(d * sizeof(char));
    len = strlen(s);
    if(len == 0 || MAX_STR < len + d)
    {
        printf("do retazca nie je mozne vlozit podretazec od zvolenej pozicie\n");
        return;
    }
    strncpy(str, s, i);
    str[i] = '\0';
    strdelete(s, 0, i);
    strcat(str, s2);
    strcat(str, s);
    strcpy(s, str);
}

void strdelete(char *s, int i, int n)
{
    int j;
    int len;
    len = strlen(s);
    if(i+n > len || len == 0)
    {
        printf("z retazca nie je mozne vymazat znaky\n");
        return;
    }
    for(j=i; j<len; j++)
    {
        s[j] = s[j+n];
    }

    s[len+1-n] = '\0';
}