Project Ta1.c

#include<stdio.h>

int main() {
    FILE *fp;
    fp=fopen("input.txt","w");
    if(fp==NULL) {
        printf("Error!! Opening FIle\n");
        return 1;
    }

    int n, p;
    char s[25];
    printf("Enter The Total Number of Items: \n");
    scanf("%d",&n);
    fprintf(fp, "%d\n", n);
    printf("Enter Item Name & Price: \n");
    for(int i=1;i<=n;++i) {
        scanf("%s %d",s, &p);
        fprintf(fp, "%s %d\n", s,p);
    }
    fclose(fp);

    fp=fopen("input.txt","r");
    int num;
    rewind(fp);
    fscanf(fp, "%d", &num);

    char str[100][20];
    int price[100];
    for(int i=1;i<=num;++i) {
        fscanf(fp, "%s %d",str[i],&price[i]);
    }
    fclose(fp);

    for(int i=1;i<=num;++i) {
        printf("\t\t\t\t\t%d. %s = %d\n", i, str[i], price[i]);
    }

    int quantity[25];
    for(int i=1;i<=num;++i) {
        printf("Enter The Quantity of - %s: ", str[i]);
        scanf("%d",&quantity[i]);
    }
    int total = 0;
    for(int i=1;i<=num;++i) {
        total += price[i] * quantity[i];
    }
    printf("Total: %d\n", total);
    return 0;
}