C code: #include int main(void) { FILE *infp, *outfp; int ID,day,hr,i=1; int Temp_ID,Total_hr; int Line_No=0; if ((infp = fopen(\"emp.txt\", \"r\"))==NULL) { printf(\"Input file cannot be opened\ \"); return-1; } if ((outfp = fopen(\"out.txt\", \"w\"))==NULL) { printf(\"Output file cannot be opened\ \"); return-1; } while(!feof(infp)) { Line_No=Line_No+1; fscanf(infp,\"%d %d\",&ID,&hr); if(Line_No==1) { Temp_ID=ID;day=1;Total_hr=hr; } else { if(Temp_ID==ID) { day=day+1; Total_hr=Total_hr+hr; } else { fprintf(outfp,\"%d %d %d\ \",Temp_ID,day,Total_hr); Temp_ID=ID;day=1;Total_hr=hr; } } } fprintf(outfp,\"%d %d %d\ \",Temp_ID,day-1,Total_hr-hr); fclose(infp); fclose(outfp); } emp.txt: 11 2 11 8 11 5 15 10 18 4 18 16 20 23 20 11 out.txt: 11 3 15 15 1 10 18 2 20 20 2 34 Solution C code: #include int main(void) { FILE *infp, *outfp; int ID,day,hr,i=1; int Temp_ID,Total_hr; int Line_No=0; if ((infp = fopen(\"emp.txt\", \"r\"))==NULL) { printf(\"Input file cannot be opened\ \"); return-1; } if ((outfp = fopen(\"out.txt\", \"w\"))==NULL) { printf(\"Output file cannot be opened\ \"); return-1; } while(!feof(infp)) { Line_No=Line_No+1; fscanf(infp,\"%d %d\",&ID,&hr); if(Line_No==1) { Temp_ID=ID;day=1;Total_hr=hr; } else { if(Temp_ID==ID) { day=day+1; Total_hr=Total_hr+hr; } else { fprintf(outfp,\"%d %d %d\ \",Temp_ID,day,Total_hr); Temp_ID=ID;day=1;Total_hr=hr; } } } fprintf(outfp,\"%d %d %d\ \",Temp_ID,day-1,Total_hr-hr); fclose(infp); fclose(outfp); } emp.txt: 11 2 11 8 11 5 15 10 18 4 18 16 20 23 20 11 out.txt: 11 3 15 15 1 10 18 2 20 20 2 34.

1. C code:
#include
int main(void)
{
FILE *infp, *outfp;
int ID,day,hr,i=1;
int Temp_ID,Total_hr;
int Line_No=0;
if ((infp = fopen("emp.txt", "r"))==NULL)
{
printf("Input file cannot be opened ");
return-1;
}
if ((outfp = fopen("out.txt", "w"))==NULL)
{
printf("Output file cannot be opened ");
return-1;
}
while(!feof(infp))
{
Line_No=Line_No+1;
fscanf(infp,"%d %d",&ID,&hr);
if(Line_No==1)
{
Temp_ID=ID;day=1;Total_hr=hr;
}
else
{
if(Temp_ID==ID)
{
day=day+1;
Total_hr=Total_hr+hr;
}
else
{

2. fprintf(outfp,"%d %d %d ",Temp_ID,day,Total_hr);
Temp_ID=ID;day=1;Total_hr=hr;
}
}
}
fprintf(outfp,"%d %d %d ",Temp_ID,day-1,Total_hr-hr);
fclose(infp);
fclose(outfp);
}
emp.txt:
11 2
11 8
11 5
15 10
18 4
18 16
20 23
20 11
out.txt:
11 3 15
15 1 10
18 2 20
20 2 34
Solution
C code:
#include
int main(void)
{
FILE *infp, *outfp;
int ID,day,hr,i=1;
int Temp_ID,Total_hr;
int Line_No=0;
if ((infp = fopen("emp.txt", "r"))==NULL)
{

3. printf("Input file cannot be opened ");
return-1;
}
if ((outfp = fopen("out.txt", "w"))==NULL)
{
printf("Output file cannot be opened ");
return-1;
}
while(!feof(infp))
{
Line_No=Line_No+1;
fscanf(infp,"%d %d",&ID,&hr);
if(Line_No==1)
{
Temp_ID=ID;day=1;Total_hr=hr;
}
else
{
if(Temp_ID==ID)
{
day=day+1;
Total_hr=Total_hr+hr;
}
else
{
fprintf(outfp,"%d %d %d ",Temp_ID,day,Total_hr);
Temp_ID=ID;day=1;Total_hr=hr;
}
}
}
fprintf(outfp,"%d %d %d ",Temp_ID,day-1,Total_hr-hr);
fclose(infp);
fclose(outfp);
}
emp.txt:
11 2

4. 11 8
11 5
15 10
18 4
18 16
20 23
20 11
out.txt:
11 3 15
15 1 10
18 2 20
20 2 34