fwrite Function >> Write Block of Memory to Binary Mode File

fwrite :

1. This Function is Used in Binary Mode.
2. Function Writes Block of Data to Binary Mode File.[i.e Writes Block to Binary File]

Syntax :

int fwrite(void *Buffer,int Size,int Count,FILE *ptr);

Examples :
1. To Write Variable x of type Float to File

float x;FILE *fptr;int fwrite(&x,sizeof(x),1,fptr);

2 . Write Array of 100 Elements

float x[100];FILE *fptr;int fwrite(&x,sizeof(x),100,fptr);

• 100 Specifies That Write 100 Floating Values to File Starting From Address Specified in Variable ‘x’.

3. Write Structure to File

struct student{   char name[50];   int roll;};main(){FILE *fptr;struct student st[20];int num;if((fptr = fopen("ip.txt","wb+"))==NULL)  {  printf("nError in Opening File");  exit(0);  } printf("How many Students : ");scanf("%d",&num);

for(i=0;i<num;i++)  {  printf("nEnter the Name and Roll Number");  scnaf("%s %d",st.name,&st.roll);  fwrite(&st,sizeof(st),1,fptr);  }//Structure is Written on Filegetch();}

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