Print a leading '+' for positive numbers in printf

user_292844 0
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I've a temperature conversion program as an assignment, which I've completed. The program has many printf statements in it which print the temperature. Now the negative temperatures are printed the way I want them but the positive temperatures are printed without a leading + sign.

Now what is the best way to get printf print a leading +sign for positive number. All I could think of is to change

printf("Min temp = %d\n",max_temp)

to

if(max_temp > 0)
    printf("+");
printf("Min temp = %d\n",max_temp)

But that calls for many changes in program :(

Another option is to write my own print function and put this logic there. What do you suggest ?

printf formatting format c string
3 Answers

I reckon you meant to do the following thing,

double num1 = 1.;

// print num1 with leading "+";
printf("%s%lf\n",num1>0.?"+":"",num1);   // +1.000000
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