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Lab10/task.c

+#include <stdio.h>
+#include <string.h>
+#include <ctype.h>
+#include <stdlib.h>
+#define USERS 6
+#define DATAVAR 4
+#define MAXLENGTH 20
+#define MAXYEARS 10
+
+void fillarray(char array[USERS][DATAVAR][MAXLENGTH]);
+int checklogin(char user[], char pass[], char array[USERS][DATAVAR][MAXLENGTH]);
+void futurebalance(char array[USERS][DATAVAR][MAXLENGTH], int years, int user);
+int main(){
+	char array[USERS][DATAVAR][MAXLENGTH],
+		username[MAXLENGTH],
+		password[MAXLENGTH];
+	int i = -1,
+		years;
+	fillarray(array);
+	while(i == -1){
+		puts("input username and password");
+		scanf("%s", username);
+		scanf("%s", password);
+		i = checklogin(username, password, array);
+	}
+	puts("how many years to calculate future balance?");
+	scanf("%d", &years);
+	while(years > MAXYEARS){
+		printf("cant calculate more than %d years\n", MAXYEARS);
+		scanf("%d", &years);
+	}
+	printf("calculating balance for %d years\n", years);
+	futurebalance(array, years, i);
+	return 0;
+}
+
+void fillarray(char array[USERS][DATAVAR][MAXLENGTH]){
+	int i,
+		j;
+	for(i = 0; i < USERS; i++){
+		for(j = 0; j < DATAVAR; j++){
+			scanf("%s", array[i][j]);
+		}
+	}
+	/*for(i = 0; i < USERS; i++){
+		for(j = 0; j < DATAVAR; j++){
+			if(j == 0){
+				printf("\nfor user %s :", array[i][j]);
+			}else{
+				printf(" %s", array[i][j]);
+			}
+		}
+	}*/
+	return;
+}
+
+int checklogin(char user[], char pass[], char array[USERS][DATAVAR][MAXLENGTH]){
+	int i,
+		j;
+	for(i = 0; i < USERS; i++){
+		if(strcmp(user, array[i][0]) == 0){
+			if(strcmp(pass, array[i][1]) == 0){
+				j = 1;
+				break;
+			}else{
+				puts("password aint right");
+				break;
+			}
+		}else{
+			continue;
+		}
+	}
+	if(i == USERS){
+		puts("username aint right");
+		return -1;
+	}
+	if(j == 1){
+		printf("hello, %s\n", array[i][0]);
+		return i;
+	}else{
+		return -1;
+	}
+}
+
+void futurebalance(char array[USERS][DATAVAR][MAXLENGTH], int years, int user){
+	float currentbal,
+			balance[years];
+	int i = 0,
+		j;
+	if(strncmp("gold", array[user][2], 1) == 0){
+		puts("account is of gold status");
+		i = 1;
+	}else{
+		puts("account is of silver status");
+	}
+	printf("your balance right now is %s\n", array[user][3]);
+	currentbal = atof(array[user][3]);
+	if(i == 1){
+		for(j = 0; j < years; j++){
+			currentbal = 1.006 * 1.006 * currentbal;
+			balance[j] = currentbal;
+			printf("%d year(s) from now your balance will be %.2f\n", j + 1, balance[j]);
+		}
+	}else{
+		for(j = 0; j < years; j++){
+			currentbal = 1.005 * currentbal;
+			balance[j] = currentbal;
+			printf("%d year(s) from now your balance will be %.2f\n", j + 1, balance[j]);
+		}
+	}
+	return;
+}