time conversion1, C (gcc)

time conversion1

//gcc 5.4.0

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

struct Map { //or use typedef struct and then struct as Map , then use Map map; //struct var
    int key[12];
    int value[12];
}map;

char* convertTime(char s[], struct Map map) {
    int length = strlen(s);
    int initLength = length - 2;
    
    char t[3],l[3],resultTime[8];
    
    for (int i=0; i<2; i++) {
        t[i] = s[i]; //get the first two chars in string
    }    
    for (int j=initLength,i=0; j<length; j++,i++) {
        l[i] = s[j]; //get the last two chars in string
    }
    t[2] = '\0';
    l[2] = '\0'; //make them string by appending null char
    
    int numT = atoi(t); //convert it to integer as we need to compare
    int newTime = 0, cmpResult = 1;
    printf("t = %d\n", numT);
    printf("l = %s\n",l);
    
    cmpResult = strcmp(l,"PM");
    if (cmpResult == 0) {
        //convert into 24hr format
        for (int i=1; i<13; i++) {
            if (numT == map.key[i]) {
                printf("came here1\n");
                newTime = map.value[i];
                printf("newTime = %d\n",newTime);
            }
        }
        
    } else { //if the time is in "AM" then no need to convert ,just remove AM substring
        for (int i=0; i<initLength; i++) {
            resultTime[i] = s[i]; //get the first two chars in string
        } 
        resultTime[8] = '\0';
        if ((s[0] == '1') && (s[1] == '2')) {
            resultTime[0] = '0';
            resultTime[1] = '0';
        }
    }
     
    strcpy(s,resultTime);
    
    return s;
}

int main(void)
{
    printf("Hello, world!\n");
    
    int initVal = 13;
    
    //insert values to the map
    //struct Map map; //either this way or in definition declare variable
    for (int i=0,j=1; i<13; i++,j++) {
        map.key[i] = j;
        map.value[i] = initVal;
        initVal++;
    }    
    //printf("map.key = %d \t map.value = %d\n",map.key,map.value);
    
    char str[] = "01:40:22AM";
    
    char* time = convertTime(str, map);
    
    printf("24hr format : %s\n",time);
    
    return 0;
}


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