Thread: Sorting strings

Any ideas for how to sort strings, check the code I commented out here it was my attempt at comparing strings. in printOrder function.

Code:

/*

My name is Jack Trocinski

*/

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

void printArray(struct xrec * a, int n);
void printArrayG(struct xrec * a, int n);
void printAs(struct xrec * a, int n);
void printFs(struct xrec * a, int n);
void computeGrade(struct xrec * a, int n);
// void printOrder(struct xrec * a, int n);
//  Wasn't sure how to make it sort
int search(struct xrec * a, int n,char * tssn);

struct xrec 
{
   char name[15];
   char ssn[12];
   char gender;
   double a, q, m, h, final;
   char grade;
};

int displayMenu(void);

int main()
{   char tssn[12];
    struct xrec temp;
	struct xrec x[20];
	int size=0, com, d, i;
	FILE * infile;
	 	
	if((infile= fopen("c:\\data.txt","r")) == NULL)
	{
	   printf("File Not Found \n");
	   exit (1);
	}
	
	while(fscanf(infile,"%15s %11s %c %lf %lf %lf %lf %lf",
	    temp.name,temp.ssn,&temp.gender,&temp.a,&temp.q,&temp.m,&temp.h,&temp.final)!=EOF)
		{
			temp.name[14]='\0'; temp.ssn[11]='\0';
			x[size++]=temp;
		}
		
	fclose(infile);
	computeGrade(x,size);
	 
	do {
		com = displayMenu();
		switch (com)
		{
		    case 1 : printArray(x,size); break;
			
			case 2 : printArrayG(x,size); break;
			
			case 3 : printAs(x,size); break;
			
			case 4 : printFs(x,size); break;
			
			//case 5 : printOrder(x,size); break;
			
			case 6 : printf("Name:");fflush(stdin); gets(temp.name);
                     printf("SSN:");fflush(stdin); gets(temp.ssn);
					 printf("Gender:");fflush(stdin); scanf("%c",&temp.gender);
					 printf("Assignment,Quiz,Midterm,Participation,Final:"); scanf("%lf %lf %lf %lf %lf",
					 &temp.a,&temp.q,&temp.m,&temp.h,&temp.final);
					 x[size++] = temp; computeGrade(x,size); break;
					 
			case 7 : printf("SSN:");fflush(stdin); gets(tssn);
			         d = search(x,size,tssn);
					 if (d < 0)
					 printf("record is not found\n");
					 else
					 x[d]=x[--size];
				     break;
			
			case 8 : infile=fopen("data.txt","w");
			         for(i=0; i < size;i++)
					 fprintf(infile,"%10s %11s %c %lf %lf %lf %lf %lf\n",
					 x[i].name,x[i].ssn,x[i].gender,x[i].a,x[i].q,x[i].m,x[i].h,x[i].final);
					 printf("File is updated.\n");fclose(infile); break;
		
			default: printf("Bad Input....\n");
						
		}
	} while (com != 8);
		
	return 0;
}

int search(struct xrec * a, int n,char * tssn)
{
	int i;
	for(i= 0 ; i < n ; i++)
	    if(strcmp(a[i].ssn,tssn) == 0)
		return i;
	return -1;
}

void computeGrade(struct xrec * a, int n)
{
	int i; double total;
	
	for(i = 0; i < n ; i++) {
	
		total= (a[i].a * .40) + (a[i].q * .15) + (a[i].m * 0.15) + (a[i].h * 0.10) + (a[i].final*0.20);
		  
		switch (((int)total)/10) {
			case 10 : case 9 : a[i].grade='A'; break;
			case 8 : a[i].grade='B'; break;
			case 7 : a[i].grade='C'; break;
			case 6 : a[i].grade='D'; break;
			default : a[i].grade='F';
		}
	}
}
	
int displayMenu(void)
{
	int c;
	
	printf("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@\n");
	printf("@                                              @\n");
	printf("@ 1. Print list of students                    @\n");
	printf("@ 2. Print list of students with letter grade  @\n");
	printf("@ 3. Print list of students with an A grade    @\n");
	printf("@ 4. Print list of students with an F grade    @\n");
	printf("@ 5. Print list of students sorted by name     @\n");
	printf("@ 6. Add student to the class list             @\n");
	printf("@ 7. Delete student from class list            @\n");
	printf("@ 8. Exit                                      @\n");
	printf("@                                              @\n");
	printf("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@\n");
	
	printf("Enter Your Choice 1-8? ");
	scanf("%d",&c);
	return c;
}
	
void printArray(struct xrec * a, int n)
{
	int i;
	for(i = 0; i < n; i++)
	printf("Name: %-15s SSN:%-11s Gender:%c %4.1f %4.1f %4.1f %4.1f %4.1f\n",
	    a[i].name,a[i].ssn,a[i].gender,a[i].a,a[i].q,a[i].m,a[i].h,a[i].final);
		
}
/* Wasn't sure how to make it sort

void printOrder(struct xrec * a, int n)
{
	int i, l;
	struct temp ;
	
	for ( i = 0; i < n; ++i) {
					for ( l = 0; l < n ; ++l ) {
						if ( strcmp(a[l].name,(a[l+1].name)) == 1) {
							temp = a[l];
							a[l] = a[l+1];
							a[l+1] = temp;
						}
					}
				}
		
	
	for(i = 0; i < n; i++) {
	printf("%-15s\n",a[i].name);
	}
}

*/

void printArrayG(struct xrec * a, int n)
{
	int i;
	for(i = 0; i < n; i++)
	printf("Name: %-15s SSN:%-11s Gender:%c %4.1f %4.1f %4.1f %4.1f %4.1f Grade:%c\n",
			a[i].name,a[i].ssn,a[i].gender,a[i].a,a[i].q,a[i].m,a[i].h,a[i].final,a[i].grade);
}

void printAs(struct xrec * a, int n)
{
	int i;
	for(i = 0; i < n; i++) {
		if (a[i].grade == 'A') {
			printf("%-15s has an A in the class.\n",a[i].name);
		}
	}
}

void printFs(struct xrec * a, int n)
{
	int i;
	for(i = 0; i < n; i++) {
		if (a[i].grade == 'F') {
			printf("%-15s has a F in the class.\n",a[i].name);
		}
	}
}

You should look more closely at strcmp -- no reason for you to assume that it will ever return 1.

Also "struct temp" is sorely missing a typename.

OK, will check that out. Thanks.