Thread: Splitting up a string

my input file will contain:


ABC|DEF|91
XYZ|LDS|78

Output should be:

First Name..........Last Name..........Grade
ABC......................DEF...................... .91
XYZ......................LDS...................... .78

I am trying to get it to split at the '|' points.


Question:

I am trying to break this up into first name, last name, and grade. I have been able to get it to split the first name and grade and print those out, but getting it to split the 3rd time is giving me trouble.

Code:

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

struct person{
       char name[30];
       int age;
       };
       int main(int args, char *argv[])
       {
               struct person list[30];
               int i,n;
               char *ch,*ch1;
               char buf[256];
               FILE *fp;

               fp = fopen(argv[1],"r");
               if(fp == NULL){
                       printf("Cannot open file %s\n", argv[1]);
                       exit(0);
                       }
               i=0;
               fgets(buf,256,fp);
               while(!feof(fp)){
                       ch = strchr(buf,'\n');
                       if(ch != NULL) *ch = '\0';
                       else break;
                       ch = strchr(buf,'|');
                       if(ch != NULL){
                               *ch = '\0';ch1 = ++ch;
                               }
               else break;
               strcpy(list[i].name,buf);
               list[i].age = atoi(ch1);
               i++;
               fgets(buf,256,fp);
               }
       n = i;

       for (i = 0; i < n; i++)
               printf("%s is %d years old\n",list[i].name,list[i].age);
               return 0;
               
               
      printf("
     
               
               
               
}

In present form the current code will take:

ABC|78
XYZ|56

and outprint:


First Name.......................Last Name.......................Grade
ABC...................................________.... ......................78
XYZ...................................________.... ......................56



So I feel like I'm pretty close. Anybody have ideas or pointers? THANKS!

Hey thanks a lot. Would you mind explaining what you added and what how it works or what it does?

Are you trying for this? See one more Example.

Code:

#include <stdio.h>
#include <string.h>
#include<stdlib.h>
#include<malloc.h>

char *replace(char *str, char *old, char *new) {
  int i, count = 0;
  int new_len = strlen(new);
  int old_len = strlen(old);

  for (i = 0; str[i]; ++i)
    if (strstr(&str[i], old) == &str[i])
      ++count, i += old_len - 1;

  char *buffer = (char *) calloc(i + 1 + count * (new_len - old_len), sizeof(char));
  if (!buffer) return;

  i = 0;
  while (*str)
    if (strstr(str, old) == str)
      strcpy(&buffer[i], new),
      i += new_len,
      str += old_len;
    else
      buffer[i++] = *str++;

  buffer[i] = '\0';
  return buffer;
}
int main() {

               FILE *fp;
               char *buf;

               fp = fopen("input_file","r");
               int i=0;
               buf=malloc(1056);

               fread(buf,1056,1056,fp);
           buf = replace(buf, "|", "---");
           printf("%s",buf);

}

thanks for the reply ungalnanban, but that isn't quite what i was looking for.

thanks vivekraj! I appreciate your time

Try the following algorithm for your additional requirement.

Code:

- Check the firstname whether it is a null.
- Compare the current lastname with next record lastname .
- The above 2 conditions are true , move that record to your target file.

First off, a really appreciate the help everyone has provided me! I have learned alot in the past few days. I believe I am VERY close to finishing this. One thing I lack is to sort the person(s) by last name. I added a swap function and a sort function, but am unsure where and how to call upon them. Any advice would be helpful, my code is as follows.

Code:

/*This program reads in a list of names, verifies their structure,
 * sorts them by last name, calculates their letter grade, and 
 * prints all relevant information in a sorted list*/

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

// Assigns the structure of a person
struct person{
        char firstName[30]; 
        char lastName[30]; 
        char grade;
        float points; 
};
// Swap function
void swap(struct person *p1,struct person *p2)
{
	char z;
	float x;
	char temp[30];
	char temp1[30];
	strcpy(temp, p1->lastName);
	strcpy(temp1, p1->firstName);
	z = p1 -> grade;
	x = p1 -> points;
	strcpy(p1 ->lastName,p2->lastName);
	strcpy(p1 ->firstName,p2->firstName);
	p1 ->grade = p2->grade;
	p1 ->points = p2->points;
	strcpy(p2 ->lastName,temp);
	strcpy(p2 ->firstName,temp);
	p2->grade=z;
	p2->points=x;
}
// Sort function	
void psort(int n, struct person student[])
	{
  	int i;
   	int j;
    for (i=0; i < n; i++)
        for (j=i+1; j<n; j++)
        if (strcmp(student[i].lastName,student[j].lastName) > 0)
    		swap(&student[i],&student[j]);
}
// Beginning of main
int main(int args, char *argv[])
{
        struct person student[30];
        int i,n,gradeCalculate;
        int a=0,b=0,c=0,d=0,f=0;
        char *ch,*ch1,*ch2;
        char ch3[10]; 
        char buf[256];
        FILE *fp;
        FILE *fp2;
// Makes sure files and loads it to buf
        fp = fopen(argv[1],"r");
        if(fp == NULL){
                printf("Cannot open file\n");
                exit(0);
        }
        i=0;
        fgets(buf,256,fp);  
// Validates that person has a last name and grade
	while(!feof(fp)){
        if(buf[0] != '|' && buf[strlen(buf)-2] != '|')
        	{	
// Splits the last name, first name, and grade
        ch = strchr(buf,'\n'); 
                if(ch != NULL) *ch = '\0';
                else break;
                ch = strchr(buf,'|'); 
                ch2 = strrchr(buf,'|'); 
                if(ch != NULL)
                {
                *ch = '\0';ch1 = ++ch2; 
                }
                else break;
                ch++; 
                strcpy(ch3,ch); 
                ch2=strchr(ch3,'|'); 
                *ch2='\0'; 
                gradeCalculate = atoi(ch1);	
                strcpy(student[i].lastName,buf);
                strcpy(student[i].firstName,ch3); 
                student[i].points = atof(ch1);  
// Calculates the letter grade
        switch(gradeCalculate / 10)
		{
			case 10:
				student[i].grade = 'A';
				break;
			case 9:
				student[i].grade = 'A';
				break;
			case 8:
				student[i].grade = 'B';
				break;
			case 7:
				student[i].grade = 'C';
				break;
			default:
				student[i].grade = 'F';
			}
// Increments letter counter
			if(gradeCalculate >= 90) a++;
			if(gradeCalculate >= 80 && gradeCalculate < 90) b++;    
			if(gradeCalculate >= 70 && gradeCalculate < 80) c++;
			if(gradeCalculate < 70) f++;                
     		fgets(buf,256,fp);
     		i++; // Increments the student array
     		}
		else
        {
        	fp2 =  fopen("REJECTS.txt","a");
        	fprintf(fp2,"%s",buf);
        	fclose(fp2);
        	fgets(buf,256,fp);
		}//
} // End of While statement
// Prints the format for the Grade list

        n = i;
		printf("\n 			        Grade list for CS-XXXX \n");
		printf("        			 ---------------------- \n\n");
		printf("Last Name				First Name");	
		printf("				Points	Grade \n");
		printf("---------				----------");
		printf("				------	----- \n");
// Runs a loop to print the array information
        for (i = 0; i < n; i++){	
// Prints the array of students
        	printf("%-30s		%-30s		%4.2f	",student[i].
        		lastName,student[i].firstName,student[i].points);
			printf("%c\n",student[i].grade);
		}
// Prints the class summary			
		printf("\n         Grade Summary for CS-XXXX \n");
		printf("         ------------------------- \n\n");
		printf("		# of A's	%d\n",a);
		printf("		# of B's	%d\n",b);
		printf("		# of C's	%d\n",c);
		printf("		# of D's	%d\n",d);				
		printf("		# of F's	%d\n",f);
        return 0;
}