Faylga ixtiyoriy murojaat qilish

FILE *fIn, *fOut;

fIn = fopen("input.txt", "r");

fOut = fopen("output.txt", "w");

... // faylni qayta ishlash

fclose(fIn);

fclose(fOut);

}

• Fayllarga ko’rsatkich

• faylni o’qish uchun ochish

• faylni yozish uchun ochish

• Qidirish uchun ko’rsatkich

• faylni yopish

• Matnlarni qayta ishlash

• s satrni o’qish :

• while ( 1 ) {
• p = strstr ( s, ", anaqa," );
• if ( p == NULL ) break;
• strcpy ( p, p + 9 );
• }

• ", anaqa,“ ni qidirish

• 9 ta simvolni o’chirish

• agar topilmasa sikldan chiqarish

• char s[80], *p;
• FILE *fIn;
• ... // faylni ochish
• p = fgets ( s, 80, fIn );
• if ( p == NULL )
• printf(“fayl tugadi.");
• else printf(“O’qilgan satrlar:\n%s", s);

• s satrni qayta ishlash :

• satr

• uzunligi

• fayl

• #include

• Fayllarni qayta ishlashni to’liq sikli

• while ( 1 ) {
• p = fgets ( s, 80, fIn );
• if ( p == NULL ) break;
• while ( 1 ) {
• p = strstr ( s, ", anaqa," );
• if ( p == NULL ) break;
• strcpy ( p, p + 9 );
• }
• fputs ( s, fOut );
• }

• while ( 1 ) {
• p = strstr ( s, ", anaqa," );
• if ( p == NULL ) break;
• strcpy ( p, p + 9 );
• }

• Agarda satr bo’lmasa sikldan chiqarish

• Satrni qayta ishlash

• “tozalangan" satrni yozish

• Satrni o’qish

• Vazifa

• input.txt faylda nechtaligi noma’lum bo’lgan satrlar yozilgan.

• 5:Matndagi barcha «qisqasi» ni «anaqa» ga almashtiring va output.txt faylga yozing.
• 6: Matndagi barcha «anaqa» ni «qisqasi» ga almashtiring va output.txt faylga yozing..

• int main() {
• FILE *fIn, *fOut; fIn = fopen("input.txt", "r");
• fOut = fopen("output.txt", "w");
• string a,b,s,key1="anaqa",key2="yaxshi"; char str[1000];
• int i,j,n,l1=key1.size(),l2=key2.size(); bool f;
• while(fgets(str,1000,fIn))
• {
• s = str; n = s.size();
• for(i=0;i
• {
• f=1;
• for(j=0;j
• if (s[i+j]!=key1[j]) {f=0; break;}
• if (f)
• { s.erase(s.begin()+i,s.begin()+i+l1);
• s.insert(s.begin()+i,key2.begin(),key2.end());
• n = s.size();
• i=i+l2 - 1;
• }
• }
• fputs(s.c_str(),fOut); } return 0;}

• Dastur