Lower case to Upper case conversion

Write a C program to convert lower case in to upper case [Don't use built in functions]

Sample input :
jobat update
Sample output :
JOBAT UPDATE


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#include <stdio.h>

int main()
{
    char string[20];
    int i=0;
    gets(string);
    for(i=0;i<strlen(string);i++)
    {
        if(string[i]!='\n')
        {
            if(string[i]>='a'&&string[i]<='z')
            {
                string[i]=string[i]-32;
            }
        }
    }
    printf("%s",string);

    return 0;
}


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