write a binary file c
FILE *write_ptr;
write_ptr = fopen("test.bin","wb"); // w for write, b for binary
fwrite(buffer,sizeof(buffer),1,write_ptr); // write 10 bytes from our bufferwrite a binary file c
FILE *write_ptr;
write_ptr = fopen("test.bin","wb"); // w for write, b for binary
fwrite(buffer,sizeof(buffer),1,write_ptr); // write 10 bytes from our bufferfile binari c
/*
Mette a 0 il massimo elemento di un vettore.
*/
#include<stdlib.h>
#include<stdio.h>
int main() {
FILE *fd;
int res;
int x;
int max; /* massimo trovato finora */
int posmax; /* posizione del massimo nel file */
/* apre il file */
fd=fopen("test.dat", "r+");
if( fd==NULL ) {
perror("Errore in apertura del file");
exit(1);
}
/* ciclo di lettura */
max=0;
while(1) {
res=fread(&x, sizeof(int), 1, fd);
if( res!=1 )
break;
if( x>max ) {
max=x;
posmax=ftell(fd)-sizeof(int);
}
}
/* torna nella posizione del massimo
e ci scrive sopra 0 */
fseek(fd, posmax, SEEK_SET);
x=0;
fwrite(&x, sizeof(int), 1, fd);
/* chiude il file */
fclose(fd);
return 0;
}Copyright © 2021 Codeinu
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