fprintf Function in C Programming

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fprintf Function

Declaration: fprintf (FILE *stream, const char *format,.....);

The fprintf() function outputs the values of the arguments that makes up the argument list as specified in the format string to the stream pointed to by stream. The operations of the format control string and command are identical to those in printf().

The following program uses the fprintf() and fscanf() function to prepare the results of 'n' students.

#include<stdio.h>           
int main() 
                        { 
                        int regno,m[5],tot,I,j,k,n; 
                        char name[15]; 
                        float avg; 
                        FILE * fptr; 
                        if((fptr = fopen("MARK","w"))==NULL) 
                                 { 
                                  printf("Cannot open file\n"); 
                                  exit(1); 
                                 } 
                       clrscr(); 
                       printf("How many students?"); 
                       scanf("%d",&n); 
                        for(i=0;i<n;i++)
                               { 
                               clrscr(); 
                                                             
        printf("Enter the details of Student-%d\n\n",i+1); 
                               printf("Name?"); 
                               scanf(%[^\n],name); 
                               printf("Register Number?"); 
                               scanf(%d,&regno); 
                              for(tot=0,j=0;j<5;++j) 
                                 { 
                                 printf("Mark in 
        paper-%d?",j+1); 
                                 scanf(%d,&m[j]); 
                                 tot+=m[j]; 
                                } 
                             avg=(float)tot/5.0; 
                                             
        fprintf(fptr,"%15s%d%d%d%d%d%d%d%f\n",name,regno,m[0], m[1],m[2], m[3], 
        m[4],tot,avg); 
               } 
                clrscr(); 
                fclose(fptr); 
                if((fptr = fopen("MARK","r"))==NULL) 
                          { 
                          printf("Cannot open file\n"); 
                          exit(1); 
                             } 
         printf("NAME\t\tReg.No\TM1 M2 M3 M4 M5 TOTAL AVERAGE RES"); 
            for(i=0;i<n;i++) 
                     { 
         fscanf(fptr,"%-15s%d%d%d%d%d%d%d%f",&name,&regno,&m[0], 
        &m[1],&m[2], &m[3], &m[4],&tot,&avg); 
         printf("%15s%d%d%d%d%d%d%d%f\n",name,regno,m[0], m[1],m[2], 
        m[3], m[4],tot,avg); 
         if(avg>35.0) 
         printf("Passed"); 
         else 
         printf("Failed"); 
         } 
         fclose(fptr); 
         getch(); 
         return 0; 
         }
fscanf Function fseek Function

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