What is the problem with this military time code coach problem of mine?

Question

#include<stdio.h>
#include<string.h>
char str[100];
char spc[100];
int main()
{
int i, j,k,x,n,m,len;
fgets(str, 100, stdin);
for(i=0;i<strlen(str);i++)
{
if(str[i]==58)
{
for(j=i;j<strlen(str);j++)
{
str[j]=str[j+1];
}
}
}
for(k=0;k<4;k++)
{
spc[k]=str[k];
}
//printf("%s", spc);
x = atoi(spc);
//printf("%d",x);
m = x/100;
n = x%100;
len = strlen(str);
if(str[len-3] == 80)
{
m = m+12;
if(n < 10)
{
printf("%d:0%d",m,n);
}
else
{
printf("%d:%d",m,n);
}
}
else
{
if(m < 10 && n<10 )
printf("0%d:0%d",m,n);
else if(m < 10 && n >= 10)
printf("0%d:%d",m,n);
else if(m >= 10 && n < 10)
printf("%d:0%d",m,n);
else if(m >= 10 && n >= 10)
printf("%d:%d",m,n);
}
}

Answer 1

Put your code in a script on sololearn playground instead of copying everything into the description – it is hardly readable and we can't test it.

Go to Code section, click +, select the programming language, insert your code, save.
Come back to this thread, click +, Insert Code, sort for My Code Bits, select your code.

Answer 2

Just tested:

Input: 01:30PM
Output: 13:30

Doesn't already work as intended?

Answer 3

Also use clearer variable names and some comments. Helps a lot, including yourself, in the near future.

Answer 4

And please, insted of ASCII values use the characters (e.g. 'P' instead of 80)