# Answer to Question #23917 in C# for fabricio

Question #23917

#include <stdio.h>

main()

{

int h1, m1, s1, h2, m2, s2, h3, m3, s3, oper, A, S;

printf("Please enter first clock:\n");

scanf("%d:%d:%d", &h1, &m1, &s1);

printf("Please enter second clock:\n");

scanf("%d:%d:%d", &h2, &m2, &s2);

printf("Enter A for addition or S for subtraction:\n");

scanf("%d", &oper);

{

if(oper=='S')

{

s3=(s1-s2);

m3=(m1-m2);

h3=(h1-h2);

if(s3<0)

{

s3=s3+60;

m3=m3;

h3=h3+24;

}

}

else

if(oper=='A');

{

s3=(s1+s2)%60;

m3=(m1+m2+((s1+s2)/60))%60;

h3=(h1+h2+((m1+m2)/60))%24;

}

}

printf("%2.2d:%2.2d:%2.2d\n", h3, m3, s3);

return 0;

}

the program only adds when i try to subtract instead of subtracting it adds them take a look n see if my if statement is wrong

main()

{

int h1, m1, s1, h2, m2, s2, h3, m3, s3, oper, A, S;

printf("Please enter first clock:\n");

scanf("%d:%d:%d", &h1, &m1, &s1);

printf("Please enter second clock:\n");

scanf("%d:%d:%d", &h2, &m2, &s2);

printf("Enter A for addition or S for subtraction:\n");

scanf("%d", &oper);

{

if(oper=='S')

{

s3=(s1-s2);

m3=(m1-m2);

h3=(h1-h2);

if(s3<0)

{

s3=s3+60;

m3=m3;

h3=h3+24;

}

}

else

if(oper=='A');

{

s3=(s1+s2)%60;

m3=(m1+m2+((s1+s2)/60))%60;

h3=(h1+h2+((m1+m2)/60))%24;

}

}

printf("%2.2d:%2.2d:%2.2d\n", h3, m3, s3);

return 0;

}

the program only adds when i try to subtract instead of subtracting it adds them take a look n see if my if statement is wrong

Expert's answer

It is better to convert the times h1:m1:s1 and h2:m2:s2into seconds, then compute sum or difference and convert it to time.

Also it is better to make variable oper to be string(char *) and compare its first letter with 'A' and 'S'.

The program can look as follows:

#include <stdio.h>

int main()

{

int h1, m1, s1,h2, m2, s2, h3, m3, s3, t1, t2, t3;

char oper[30];

printf("Please enter first clock : ");

scanf("%d:%d:%d", &h1, &m1, &s1);

printf("Please enter second clock: ");

scanf("%d:%d:%d", &h2, &m2, &s2);

printf("Enter A for addition or S for subtraction: ");

scanf("%s", oper);

// convert bothtimes into seconds

t1 = s1 + 60*m1+ 3600*h1;

t2 = s2 + 60*m2+ 3600*h2;

// check thatthe operation is correct

if( (oper[0] !='S') && (oper[0] != 'A') )

{

printf("Wrong operation.

");

return 0;

}

// compute sumor difference

if (oper[0]=='A')

{

t3 = t1+t2;

}

else

{

t3 = t1-t2;

}

// make t3positive

while(t3<0)

{

t3+=24*60*60;

}

// convertobtained time t3 into the time inside 24 hours

// that is takethe remainder of division t3 by number of seconds in 24 hours

t3 = t3 %(24*60*60);

s3 = t3 % 60;// number of seconds in t3

t3 =(t3-s3)/60; // remove seconds from t3 and convert it to minutes

m3 = t3 % 60;// number of minutes in t3

t3 =(t3-m3)/60; // remove minutes from t3 and convert it to hours

h3 = t3%24; //number of hours

printf("%2.2d:%2.2d:%2.2d

", h3, m3, s3);

return 0;

}

Also it is better to make variable oper to be string(char *) and compare its first letter with 'A' and 'S'.

The program can look as follows:

#include <stdio.h>

int main()

{

int h1, m1, s1,h2, m2, s2, h3, m3, s3, t1, t2, t3;

char oper[30];

printf("Please enter first clock : ");

scanf("%d:%d:%d", &h1, &m1, &s1);

printf("Please enter second clock: ");

scanf("%d:%d:%d", &h2, &m2, &s2);

printf("Enter A for addition or S for subtraction: ");

scanf("%s", oper);

// convert bothtimes into seconds

t1 = s1 + 60*m1+ 3600*h1;

t2 = s2 + 60*m2+ 3600*h2;

// check thatthe operation is correct

if( (oper[0] !='S') && (oper[0] != 'A') )

{

printf("Wrong operation.

");

return 0;

}

// compute sumor difference

if (oper[0]=='A')

{

t3 = t1+t2;

}

else

{

t3 = t1-t2;

}

// make t3positive

while(t3<0)

{

t3+=24*60*60;

}

// convertobtained time t3 into the time inside 24 hours

// that is takethe remainder of division t3 by number of seconds in 24 hours

t3 = t3 %(24*60*60);

s3 = t3 % 60;// number of seconds in t3

t3 =(t3-s3)/60; // remove seconds from t3 and convert it to minutes

m3 = t3 % 60;// number of minutes in t3

t3 =(t3-m3)/60; // remove minutes from t3 and convert it to hours

h3 = t3%24; //number of hours

printf("%2.2d:%2.2d:%2.2d

", h3, m3, s3);

return 0;

}

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